PowerPC :: Turns Itself Off - Emits High Pitch Squeal From Machine While Holding Button

Sep 28, 2009

When I turn it on it runs fine for sometimes about a minute (sometimes less) before it just turns itself off! After it turns itself off I'll hit the power button and it emits a high pitch squeal from the machine whilst holding the button. If I then remove the battery from the Machine depending on how long I leave the battery out and put it back in, it will then power up for a short amount of time. Sometimes I can get it to the desktop and open System Profiler for example, other times it gets as far as the Apple grey screen. I've ordered a power adaptor as I didn't get one with the machine but as far as the battery indicator goes, it's on 96% and all four green lights are on the battery indicator on the base. Has anyone heard of any problems like this before?I believe it's running a 500mhz processor and has 512mb of Ram.

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PowerPC :: Holding Down Power-button While IBook Is Off?

Nov 17, 2008

This is a mystery to me. Long story but the gist of it is that I found if I hold down the power-button on my iBook while it's off it goes into some weird mode. i.e. fan spins, disc spins, sleep light flashes and a tone comes from the speakers.Is this some sort of hardware test mode? Is it going to blow up? Is it resetting something?

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PowerPC :: Chime Sounded For Few Seconds On Holding Power Button

Sep 20, 2008

I have a 17" G4 1Ghz iMac, we used it until 10 months ago when I got my new 24" Intel 2GHz machine. That new 24" iMac is now in the basement craftroom as the digital hub for pictures/video/etc., while I brought the 17" G4 1Ghz iMac out from my closet for the upstairs loft general web surfing machine. It worked for 2 days and upon shut down would not re-start. I could only hear the fan and nothing else. If I held the power button for 10 seconds upon trying to start up there was a chime that sounded for a few seconds. Once the fan is making small sound, nothing else, if I hold power button for 5-20 seconds the computer will shut down (fan turn off).

Did some online checking, found article on PMU, so I did try and re-set PMU via the apple support article.Resetting the iMac (Flat Panel) Power Management Unit (PMU). Still, no re-start. It was running the latest 10.4.x update upon being put away for 10 months. Here is a picture of the bottom, the red light is on upon trying power on, my finger is on the PMU reset button. Is there any other diagnostic thing I can do? Is there a battery on this logic board that I can check/replace? I'm 100% ok at taking it apart and trying anything to fix it.

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Mac Pro :: High Pitch Sound In Mac Pro 8 Core 3GHz?

Mar 6, 2008

I have this high pitch sound that started intermittent this morning .

Now it's getting more frequent and last longer.

It just stopped when I moved the power saver setting of the video from never to an hour.

I'm not sure where it's coming from yet.

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MacBook Pro :: High Pitch Noise From Screen

Aug 20, 2014

I've noticed on my MacBook Pro (late 2013 with retina, 13", 2,4GHz i5, 256GB SSD, 8GB Ram) that when I run the display on low brightness, there is a high pitch noise coming from the screen (inverter problem)? It seems as it disappears when adjusting to either a high brightness or turning it to zero.

Info:
MacBook Pro with Retina display, OS X Mavericks (10.9.4)

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MacBook Air :: High Pitch Beeping Sounds Every 5 Seconds

May 25, 2008

i was bored and decided to put my ear up to the area right of my air's trackpad, my ear was actually pressed up against the case. oddly enough, i am able to hear a somewhat high pitch beeping sound every 5 seconds. anyone else care to do the same and report back?

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Mac Pro :: Not Reading Any Discs - Make High Pitch Sound And Eject

Jul 14, 2008

I just purchased a mac pro about 4 months ago and I love it, I have never had a problem with it until today, I went to install a new program on it and it did not even read it, it made a hi pitched sound for a short time then stopped, waited about 10 seconds did the same thing. After a couple times of doing this it would eject the disc, so I figured I would try another disc, I have tried many different discs such as games, cds, programs and nothing has worked.

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MacBook :: Brightness High Pitch Noise In Bootcamp With Windows

Jul 18, 2009

I have a macbook ALU. When I stay in bootcamp with windows if I put the brightness between 30 80%
I listen a high pitch with nvidia drivers if I uninstall the drivers I don't have this problem.

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MacBook Pro :: Screen Only Turns On While Holding Key Down

Apr 7, 2010

I just bought a refurbished macbook pro and at first the screen wouldn't turn on when I started it up, the little sleep light was on though. I pressed and held down a key for a few seconds right after pressing the power button and the screen worked. My question is, should I be worried about this? I got the computer from a company I later found out is really difficult to deal with so I don't want to have to return or exchange it, but I also want to get my moneys worth.

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MacBook :: High Pitch Sound Emitted At Certain Screen Brightness Levels

Jan 28, 2009

Whenever my screen is not turned up to the maximum brightness, a really high pitched sound is emitted from the laptop. If you've ever heard the "mosquito ringtone", that's basically what it sounds like. Really odd. It's definitely got something to do with the screen brightness, and I basically can't use my laptop at medium brightness because the sound drives me a little nuts. Turning the brightness to the lowest setting makes the sound less intense, but it's still audible.

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Mac Pro :: High-pitch Noise Coming From External Speakers When Play A File

Apr 2, 2012

I just bought a pair of the Rokit 5 external speakers. When I plug them into a Mac Pro (Tower) I get a high-pitched hum from the speakers each time I try to play a sound. So if I go into System Preferences/Audio, and I try to play a sound, the high-pitch is heard as the sound plays, and for a second or two after, then it goes away, and is heard again each time I try to play a sound. Same with when I play something thru iTunes or any of my audio apps. 

If  do the exact same thing playing from a Macbook, I do not have that problem at all, the sound is nice and clear with no high-pitch sound. 

I have the speakers plugged in using 1/4 inch jacks to an external sound card (MBox), and this audio card is plugged USB into the Mac. 

Info:
Mac Pro, Mac OS X (10.6.8)

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MacBook Air :: System Making A Strange Noise / Loud High Pitch Whine

Jun 18, 2008

Hey guys, got a little issue here. I have had a MBA since about march of this year. Just recently I on two occasions the computer has all of a sudden had this loud high pitch whine. It has only happened twice and at both times (if I remember the 1st time correctly) I wasn't really doing anything on the computer. Today specifically it was just sitting idle on my desk. Not sure where its coming from maybe speakers? Any idea to what this is? Should I be setting up an appointment to see a Mac Genius?

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MacBook Pro :: Does Not Shutdown Even When Holding Power Button

May 7, 2012

Today I started to watch a video from a news site (probably using flash) and the computer started to slow down very much so I thought firefox had crashed. Then I force quit it and waited about a minute or two hoping the computer would get fast again as usual but it did'nt happen, so I tried to log out and nothing happened and then I tried to shut it down by clicking the power button and clicking in shut down.

Right after that, the computer started to shut down or log off (it was still very slow) and something happened it stopped in the middle of the process and displayed a blue screen (the same colour that appears when you connect another monitor to the mac). Then I thought of using my last resource: holding down the power button until the computer turned off but again, nothing happened.

Info:
MacBook Pro, Mac OS X (10.7.3)

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IMac :: 27" I7 Imac High Pitch Noise

Sep 8, 2010

I have a new 27" I7 that appears to have the high pitch sound issue if the brightness is not at max or lowest. How "common" is this issue?

I do not need the perfect iMac (I have some gray banding and the 1TB HD grumbling and it is not a big issue to me) I just wanted to see if this high pitch noise is considered a defect and needs to be fixed/replaced or it is more common than not with the iMac.

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IMac PPC :: Computer Won't Start / Tried Unplugging And Holding In Start Button

Jun 21, 2012

computer won't start. tried unplugging and holding in start button. After about a half hour and unplugging a few times, finally got it going.  Imac G5

Info:
iMac, MacOS X (10.5)

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MacBook Air :: Need To Press Power Button For 10 Seconds Before It Turns On?

Sep 2, 2014

macbook air 2013 needs power button pressed for 10 seconds before it turns on? also I've tried resting PRAM but when i press the 4 buttons before the start up screen it never restarts again?

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PowerPC :: Advantages To Holding On To IBook G4

Jun 15, 2008

I was planning on selling my iBook G4 to assist in buying a refurb MB, but might there be any advantages to hanging on to it? The only thing I can think of is as an additional backup, but as it is only 60 GB, doesn't seem worth it. Book G4, 1.33, 640MB, 60 GB. Any creative uses for it or is it best to sell?

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PowerPC :: G4 Holding Option Key During Startup Does Nothing

Jun 19, 2010

So I bought a "new" PowerMac G4. I have two already.

The guy said it was running os 9 but now it wouldn't boot. I figured it needed an OS and the guy was wrong. I try to boot it up...

flashing ? folder

So I go thru all hell trying to install os x and what not.

It won't boot to the install CD. I finally got it to boot from my other Powermac's HD with OS X on it, but I can't seem to install OS X on this other HD, but that's not really what I'm asking here...

When I startup the PM and hold Option, nothing happens with either HD installed!!! No boot menu comes up.

Also when I hold down C, nothing happens at least nothing different. It doesn't boot to the CD.

Why is this?

Sometimes it seems to boot to my HD OS X and sometimes it boots to the CD on it's own. I can't choose what I want it to boot to unless I start the OS X and select it from there.

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IMac :: Boot Into 64 Bit Mode (holding 6 And 4 As The Machine Boots) It Does Not Flicker?

Jan 5, 2010

I have a week 50 machine with the firmware update that flickers only when Snow Leopard is in 32 bit mode. If I boot into 64 bit mode (holding 6 & 4 as the machine boots) it does not flicker. Can anyone else confirm this?

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MacBook Pro :: Time Machine Not Showing Up When Trying To Boot And Holding Option Key

Sep 13, 2014

Drive isn't showing up when booting mac book. How to fix this?

Info:
MacBook Pro

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IMac :: Computer Froze After Loud Speaker Squeal During Video Playback

Mar 7, 2009

I just received my refurb 2.8Ghz 24" iMac today. I have been setting it up and transferring files to it for the last few hours. I just installed 4GB of RAM from Crucial to upgrade from my 2GB that came preinstalled. I opened Hulu and started watching a video full screen while I was working on something in the same room. All of a sudden the playing video froze and there was a loud high pitched squeal coming from the speakers and some crackling, followed by another high pitched squeal from the speakers and then the computer froze.

I know it wasn't a fan noise or a hard drive noise, it was definitely a high pitched audio tone and crackling from the speakers when it hung up. The only way I could make it stop is to hold down the power button and turn it the iMac off. I wonder if it could have been my photo collage screensaver kicking in while the hulu video was playing fullscreen that caused something to lock up? It seems like it was in the timeframe from when I walked away from the computer to the time it crashed.

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PowerPC :: Unusually High Fan Revving / Dual 1.8 GHz PowerPC G5

Dec 21, 2006

I have a Dual 1.8 GHz PowerPC G5 with 2.5 GB of RAM. My fan starts revving really loud when I am using multiple apps (Adobe CS2, Firefox, iTunes) and while watching a video tutorial or AVI movie (both saved on my desktop). It also happens when I am just watching a AVI movie with no other apps open.

I just added one GB of RAM yesterday thinking maybe this will solve the problem since I am running multiple apps. This did not resolve it. So I searched the messageboard for threads on fan issues similar to mine. I read it may be caused by the tempature in my room. I keep the tower on my floor on top of 2 pieces of wood about a 1/2 inch thick. I live in a small brick studio apartment so the tempature is usaully between 60 to 70 degrees.

I looked into smcfancontrol but it looks like its for laptops only.I also do not have a utilities program for my computer yet. I was wondering what was the best program out there to clean up/tune-up my hard drive so its running at maxium speed.Has anyone had experince with this issue and have any answers? I am concerned this may be very detrimental to my computer in the long run.

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PowerPC :: Ibook Only Turns On After Hit It?

Aug 25, 2006

A couple of weeks ago, out of the blue, my Ibook 12" started turning off by itself.

At first it would turn on again, I was able to check the HD with the Disk Utility, which reported a fault in the HD. Then after a few times it wouldn't turn on anymore. I couldn't hear the chimes sound and the fan (or HD) would start running pretty fast.

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PowerPC :: IBook G4 Turns Off Automatically?

Jan 6, 2011

Thought it would be fun to troubleshoot it, since I already own one and have taken it apart.

Here's what's wrong with it.

I've gotten it to boot up. Curiously, it describes itself as a powerbook!?

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PowerPC :: G4 Turns Itself Off / Shuts Down Unexpectedly

Sep 23, 2008

I've a MDD G4 dual 1.0 along with the wide acrylic-bezel 20" Mac monitor with the light in the lower right corner. Yep, it's starting to look ancient. But I still have much use for it EXCEPT that it has a very nasty habit of turning itself off catastropically in mid-thought, as it were. Oddly, this behavior comes and goes in spurts. it will hit hard for a couple of weeks then a couple of months will pass with relative peace and stability. Then, back to the crisis.

Sometimes I get a warning from that power-on light in the bezel -- it might flash brighter for an instant, then within a few seconds the whole system loses power just as if I'd turned off my power strip. Other times, it pops in and out of sleep mode for several cycles, but usually this ends the same, with no power at all. Odder still, the machine has a tendency to turn itself on unaided. This can happen even after a controlled shutdown. It turns on, acts normal for 20 minutes, then maybe goes to sleep and wakes up a couple of times, then crashes. No intervention at all on my part at any time. This is not a software shutdown of any controlled variety. Anyone know what's happening? I can't tell you how much gnashing my teeth have endured.

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PowerPC :: G3 Unable To Boot Up - Turns On But No Chime

Nov 20, 2006

Late last night, I ran into some problems with my iBook G3. It's the 700 Mhz model, with 384MB of RAM. Nothing else special in terms of hardware config (unless an Airport card is special). OS X 10.2.8.

Basically, the computer seemed to hang and I did a hard reboot, and upon starting up I got a folder with a flashing ? .

I can't seem to find my Install disc 1 to run Disk Utility or just boot up - hopefully I will find that when I go home tonight (or maybe I left it at my parent's place), but I checked using the Hardware Test CD and it didn't detect any problems.

I am having problems opening the CD drive, so I've had to open it using a paperclip. Sometimes it doesn't appear to be using the CD.

I also have run the Micromat test CD that came with Applecare (of course this machine is almost 4 years old so that's finished...) and it detected a problem with the Read Buffer last night, but then I guess the battery ran out while it was on the last test.

This morning, I ran the Read Buffer, Write Buffer, and Volume structure tests and the first two passed very fast (unlike last night), but the Volume Structure test failed. I'm not surprised since I've been aware I have issues with this before. I tried to repair before going to work but at one point it seemed to hang so I gave it another hard reboot.

Last night, I would sometimes get the apple logo with the spinning "clock", and sometimes I would get the ? but it would never get to the login screen.

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PowerPC :: IBook LCD Turns Off When Fully Open?

Oct 5, 2009

My co-worker needs help with his iBook.

I switched when the Mac Mini came out, so seeing this iBook from 2001 is pretty interesting.

Anyways, he's having problems with the LCD that when he opens it all the way the LCD turns off. Any ideas for DIY fix? He also wants to know if he can add Wi-Fi?

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Software :: IMac G5 PowerPC Automatically Turns Off

Sep 5, 2009

My iMac runs for 10-15 minutes and then turns itself off. This has happened 3-4 times in a row.

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PowerPC :: Powerbook G4 Turns Off / Battery Charger Is Unplugged

Jun 20, 2005

My Powerbook G4 only turns on if the battery charger is plugged in, and if I unplug it, the computer shuts off. On the menu bar, it says charging. I know the battery has to be full. This just started happening last night. Also, I just had the hard drive replaced and I've only had it back for a couple weeks.

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PowerPC :: Screen Turns Bluish After Sleep Mode

Nov 24, 2006

I have a little problem with my last generation 12" Powerbook G4. Sometimes, after I wake it up from sleep mode, the screen has a kind of blue tinge to it, as if there was some blue transparent plastic stuck to it. After I reboot, it's just fine.

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