PowerPC :: G5 Won't Turn On ... Blinking Power Button / White Light Every 4 Seconds
Jul 21, 2009
I have a G5 dual 1.8 power PC...Bought some ram put it in & booted up. Then a red light came on the logic board behind the power button. The machine wouldn't turn on....I called apple care & we rearranged the ram, now the red light is gone but my system still won't boot up. The white power light blinks every few seconds... the apple store told me sorry can't help because your machine is vintage. Even if my logic board is fried is there a place to buy one on the cheap?
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Mar 25, 2009
The other day the screen started blinking randomly. It'll flicker for a few seconds and then go white with vertical grey lines for a few seconds. Then it will go back to normal. There doesn't seem to be a pattern to it. Sometimes it will go through that process for five minutes and then stop. Other times I can be working on it for hours and nothing will blink or act screwed up.
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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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Nov 26, 2008
Does anyone know if there's anyway to turn on an aluminum powerbook without the power button? I mean is there any keystroke combination that can turn a powerbook on?
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Jul 16, 2008
I'm a relatively new Mac user. In fact, I haven't had that much experience at all. I work in a donations store and today we got a donation of an iMac. I searched around a bit and I'm sure it's a G5 model. It looks like [URL]. It looks to be in great condition, no scratches, not even a fingerprint on the monitor.
However, when I turned it on, after plugging the power chord in, I started experiencing problems. The fans kicked on and I heard the chime (I assume that was a post?) but I was getting no video and the white LED on the front of the screen was flashing on and off. The exact pattern is strange - I don't think I've see it before. It flashes once, then stops, then flashes again, then stops. Over and over. No sequence. :| The computer did not come with a keyboard or a mouse. I was testing it to see if it actually worked, before I bought the keyboard and the mouse, so I'm wondering if it has something to do with that? I'm not really sure.
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Dec 6, 2007
I added 2 sticks of 512 to my power mac g5 1.6. I had ahard time getting the computer to see the new ram, but finally was able to kinda get it working after zapping the pram. However my computer only saw these 2 sticks as 256, odd. So i attempted to troubleshoot the problem. I tried just installing the new ram, but the computer wouldnt boot. I tried a few different combos with the other 4 sticks i had, but nothing. I put the old memory back in, and still nothing. The power led looks to blink once every five seconds or so. I tried pressing the pmu reset button, but still the same out come. I also tried taking out the battery, nothing.
Information:
1.6 g5 single proc
Mac OS X (10.5.1)
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Jun 5, 2014
We're not used to having the computer's power button on the keyboard. Occasionally, when trying to hit Delete, one of us turns off the computer power. I'm wondering if there is a setting (I really don't know my way around macs or I'd check myself) that can trigger the shutdown only after the power button has been held 3 seconds or more. This would prevent those accidental shutdowns.
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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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Mar 31, 2008
The iMac G5 (17") doesn't want to boot up, when I press the I/O button it flashes with its white light, and then nothing happens. When I do that with the back-cover off light 1 is lit as long as the machine has power, but light 2 only flashes when I connect the pins that the powerbutton connects. I know that there was a problem with the powersupply, but the soldering I did should have fixed that.
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Sep 4, 2006
Tonight I came into my office and my PowerBook was sleeping. I have an external display and I usually turn my display on and wiggle the mouse (after I turn that on) and nothing happened. I looked and my display was still in standby mode, my wacom and eye tv had the same behavior. The powerbook light stopped blinking (I heard the drive wake) and then nothing. Nothing happened still. I opened the lid, hit the power button and still nothing. Held it down, and nothing. I ended up having to take the battery out and then I started the machine. Since then I've rebooted twice just for fun and since then the below screenshot shows that the "Jessica's Computer" window keeps popping up.
Two questions:
#1 What could have happened or what does it mean when the powerbook is sleeping, then wakes but never really wakes and just shuts off?
#2 What is up with that window opening as though this is some sort of start up program you'd find in windows?
Specs: Powerbook 1.67 ghz second to last rev...rev D I think. 1.5 gig ram. os 10.4.7
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Mar 6, 2010
So this morning I woke up and went to press the power button of my Macbook, but nothing happened. I noticed that there is no white IR light and the fan doesn't respond. I checked the battery, it was at full. The power cable was also green when i plugged it into the Macbook. However, it still wouldn't turn on.
Just a general comment, I use the Macbook as a printer server and to browse the internet, so nothing intensive is forced onto the Macbook.So then I tried resetting the SMU, didn't work. I tried turning it on with only battery , and then with only power source, both didn't work either.I have never spilled anything on this macbook, never dropped it, smashed it, or abused it in any way. However, it is 2 years old and I never bought Applecare (Usually, if something is defective, it will show within the first 30 days). I assume it's a logic board failure, and it's going to cost around 700 to fix (which i'd rather just get a new macbook).
I was wondering if anybody know of a reason why the logic board broke, or if there is any remedies that i haven't tried yet?Also, I'm thinking of pawning it off on ebay and then save up and wait for the Macbook Pro refresh. Does anyone have an estimate on how much I can get for a broken Macbook (screen is fine, 4gb of ram (i might replace it w/ 2gb instead) 250 gb HD (might replace with 80gb HD instead), 2.0 ghz c2d (prbly useless cuz the logic board is fried)
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Mar 21, 2009
i just got my new imac 2 days ago. I was wondering is there another to turn on the power without pressing the power from button? (cuz i remember u can power on from the keyboard b4)
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Apr 20, 2012
My PPC G5 Mac Power Pro has been working fine, on one startup recently the screen didn't come on, the keyboard and mouse did not pass the startup test and the white light flashes three times. After a while the fans go into hovercraft mode! I've reseated the RAm and checked all other cards.
Info:
PowerMac, Mac OS X (10.5.8), To be supplied
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Jun 11, 2012
I have a white 2008 model MacBook. Due to some unfortunate tampering with the circuits under the right command key on the built in keyboard, a lot of the keys and the power button are now effectively dead. I'be ordered a replacement top case, but was wondering if I could, in the meanwhile, somehow turn the laptop on. I'd prefer to do this without opening it up, though I could if that's the only way.
I read in another thread, can't find the link now, that disconnecting the battery, connecting mains, then connecting the battery would turn it on, but that doesn't seem to work for me.
Info:
MacBook (13-inch Early 2008), Mac OS X (10.7.4)
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May 10, 2010
my brand new mbp 2010 froze and i had to press the power button to turn it off. Will everything be ok?
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Apr 17, 2012
My MacBook pro (15" unibody, non-removable battery) will not turn on. The battery claims to be fully charged. The computer will not respond to the power button in any way. I had turned it on previously by draining the battery completely of any charge (draining power, then pressing and holding down power button for 60 seconds). When this occurred the computer booted up and ran fine. However, when I closed the lid, it turned off immediately, never to return. I'm wondering if this is a problem with the battery, or if it's a problem with the logic board.
Info:
MacBook Pro, Mac OS X (10.7)
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Jun 26, 2008
Got a 4 year old 15" PowerBook with a small history of battery issues. Its on its 3rd battery that is on its last leg. It can't be unplugged for more than 5 seconds or it shuts off...been this way for months. Well today it shut off and won't turn back on. Do I buy yet another battery or is my pb dead?
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Jun 21, 2012
My imac does not turn on, not even make the noise when booting up. The only sign of life is the blinking light that tells you is on.
Info:
iMac, iOS 5.1
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Nov 30, 2009
Just got a replacement imac 27 stock C2D yesterday for a defective one I had earlier, however, I couldn't get this new one to turn on till just a few hours ago. I just figured out the power button needs quite of bit of pressure to turn on. Seemingly just pressing it until it clicks isn't enough. Should this be looked at or is this normal?
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Aug 22, 2014
So I'm having issues with the computer not waking up in the morning. I guess it goes into a deep sleep of some sort and I have to hold the power button twice to turn it on, and get greeted with a computer experienced a problem message on login.
The most recent log in the system diagnostics is titled:
aosnotifyd,diskarbitrationd_2014-08-21-184310_MacBook-Pro.shutdownStall
And the brief details are:
ate/Time: 2014-08-20 22:02:42 -0700
OS Version: 10.9.4 (Build 13E28)
Architecture: x86_64
Report Version: 18
Command: No Target
[code]....
Info:
MacBook Pro (Retina, 15-inch, Mid 2014), OS X Mavericks (10.9.4)
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Jun 1, 2014
A few hours ago i tried to turn it on but it only showed the apple screen for a few seconds and turn off automatically.. i can't turn it back on anymore..
It doesn't response to the power button nothing happen after pressing the button. I am sure it is charged... what should i do..?
Info:
MacBook Pro (Retina, Mid 2012)
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Jun 6, 2014
1.turn into black screen after running for about 15 mins, but the system is still running because the keyboard is still functional. After reboot, i record the log as below, it shows that it is a GPU Panic.
2. display would not turn on after pressing the power button but can still hear the apple start up chime and the system keep running with the screen off.
3. after erased the hard drive and re-installed Mavericks. Under a new installed system, it can run normally for about 1 day, after that especially after a shut down or restart, the problems above came back.
I am currently working in Thailand but I have no plan to go back to the US in a short period of time. I brought the laptop to the local apple service, they said it is certainly the logic board or GPU failure and the parts need to be replaced. The cost of the replacement is around half of the price that I paid for this laptop.
Anonymous UUID: 398E619F-8811-6838-BEFC-13DF20E24CAE Tue May 27 10:02:04 2014panic(cpu 4 caller 0xffffff7fa970bf7c): "GPU Panic: [<None>] 3 0 a0 d9 9 8 0 3 : NVRM[0/1:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0x102c00000 0xffffff8138e01000 0x0e7150a2, D0, P3/4
[Code]....
Info:
MacBook Pro with Retina display, OS X Mavericks (10.9.3)
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Feb 10, 2008
I have a iBook G4 laptop and there seems to be something very wrong with it. It started a few days ago just randomly. I was reading something on the internet and the screen went black on me, but the power was still on (I clicked CAPS LOCK to see if there was power). I then proceeded to push the power button and the power went off. When I pressed the power button again to turn it on, it made that internal noise it always makes and then the fan came on, and wouldn't turn off. There was no picture on the screen at all. Completely dead. But there was power, because when I clicked on the CAPS LOCK, the light came on). I tried pressing on the power button for at least 15 seconds and even went as long as a minute, and the power didn't go off.
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Oct 7, 2006
I'm using a B&W Power Mac G3 with 512MB RAM and OS X Tiger for a SMB file server (with 5 users) and a USB printer server. Everything is working good, but I have a problem.
It doesn't have a monitor or keyboard/mouse attached normally (I can configure it via VNC). The problem is that I would like to be able to turn the machine off when it's not needed (like at night sometimes, days when I won't be home, etc.). I would like to just hit the power button and have it turn off, however it puts it to sleep instead.
Normally, sleep would be fine, except on the B&W, the fans still run, just the HDs shut off, so it's still noisy as heck.
Is there a way to make the power button shut it off? If not, any other easy methods of shutting it off you can think of? Via VNC won't cut it, as my dad needs to be able to turn it on (not a problem) or off as well.
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Feb 20, 2007
Is there a way to turn on the light in the keyboard even if there is enough light to keep it off?
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Jul 15, 2010
my screen keeps blinking on and off every 10 seconds or so and if I let it rest for a while it settles down but everything is missing from the screen except my screen saver photo.
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Jan 7, 2007
I know I can get the bulk of it here: [URL:..] But is there a controller board? I can't find any documentation on this thing. I want to use it for a PC. Making an acrylic top is no problem. Just looking for pin-outs, dimensions, and maybe some pictures of someone else dissecting one.
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Oct 30, 2008
I was just wondering if anyone knows how I can remove my eMacs power button, the one that you press to turn the computer on. I kinda wrecked mine and I want to "pop" it out to have a look at it. Looking at replacement costs they are like 50 bucks so I need to try what I can before I fork out for a new one.
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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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Apr 2, 2007
I have an ibook G4 (2years old, a part of the battery swap program) that charges normally... for about twenty minutes. Then the light around the charger turns from it's normal "i'm charging" orange to nothing, the light goes out and the ibook switches to battery power. I've just inspected the power chord and there are no strains or tears, the plug at both ends are in good condition and the ibook power socket is fine too.
I've turned the ibook off for a period of time (two days) and reset the power manager... still no difference. The ibook looks and acts just like it should until about twenty minutes into the charge then the light turns off and it's like it's been disconnected. The chord is in correctly, i've even tried the apple extension chord = no joy. If i reconnect the power chord at the wall it's fine, starts charging again... and yes i've tried different sockets on different circuits in the house!
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