Power Mac G5 :: Shuts-down A Few Seconds After Start-up?
Nov 21, 2007
I've got a strange issue with my PowerMac dual 1.8GhZ and I can't figure out where it's coming from.Last Saturday I experienced a Kernell Panic while using Safari and the Dictionary (MacOS 10.5.1).Since then, whenever I try to start my computer, it shuts itself down while the grey screen with the Apple logo is on screen. However, this isn't always the case:I can use my computer 'normally' if I press the option key at start-up and manually choose my startup disk.
I can boot from a Panther or Tiger installation disk, but not Leopard.If I try the hardware test the computer shuts itself down in the middle of the test.TechTool works and didn't find any issues with my computer. Nor did Disk Utility.I tried to erase both my internal hard-drives and do a clean install of Tiger, but the problem is still there (I have to press option at startup).I tried to reset the PRAM and Cuda/PMA. Doesn't resolve the issue.When I tick 'Restart automatically after power failure' in Energy Saver my Mac will indeed restart, meaning it thinks there was a power failure.Any idea what it might be? And why it only happens in certain situations?Do you think it's a hardware or a software issue?
Information:
PowerMac G5 dual 1.8GhZ
Mac OS X (10.5.1)
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May 15, 2012
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Jun 26, 2008
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Mar 15, 2012
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Jul 5, 2012
I have a late 2010 MacBook Air.Unfortunately, I'm in a country without an Apple store or any kind of official Apple support (no phone number to call).
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However, the next day, the same shut-down occurred (when I plugged in the modem again) and now SMC reset is not doing anything. I've held down the start button for a very long time and there aren't any signs of life. The light on the charger shows that it is charging when I plug it in.
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Info:
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Jan 25, 2010
This is a new problem, started immediately after moving the computer gently a foot to the left...
When computer goes to sleep it shuts down.
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Feb 25, 2008
My comp. has worked perfectly, Then I installed some updates, Itunes i think? And the comp. Shut down, and when it restarts it works for a min or two, then freezes, and i get the beach ball, that just spins around and around forever.
if I don't try to open anything, or do anything when i restart it, it will just shut down, and restart, then when it comes to the Grey screen with the apple and the little circle below it, the circle looks all pixilated, and just freezes
that is the version its on (Taken two days ago, and sent to a buddy for other reasons completely)
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Feb 1, 2009
This has been a great computer - bought new in 2004. Recently started to click "off" as it was just powering up. I thought there was a bug - so did a clean and install for OS X - but still does it. The only way to start computer is to hold the Options & Alt key and P and R key at start up until I hear 6 dinging noises of start up (why six is the magic number I don't know. But it is the only combo that works!). Once it is up and running no problems.
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I have one G5 on my network that the fan comes on every 60 seconds. I have done everything I can, including moving the temperature sensor. If the sensor needs to be replaced, who extensive is it and can I do it myself?
Information:
Power Mac G5
Mac OS X (10.4.10)
Network Administrator
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Aug 13, 2009
My Mac attempts to start up and automatically shuts down on it's own. It continues to start and stop for several minutes and finally boots up. Once it's up it works OK. I've had it in to the Mac store and they tell me it's probably the power supply, but after leaving it on all weekend it seemed to work OK so they didn't do anything. After I brought it home it is still acting in the same way. It's only on trying to start up that it cycles through the start - stop action. Once I turn it off it's the same problem on trying to start again. Does this sound like a power supply problem?
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Information:
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Info:
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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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Jan 29, 2010
Power MAC G5.
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Jun 14, 2012
My MacBook Pro 13" Mid-2009 has recently started to shutdown unexpectedly when it starts running on battery power, I don't know if its the battery or the motherboard (I hope it isn't).Â
I tried resetting everything, reinstalled the whole OS, repaired permissions (don't know what for), but I keep getting this. It started about a month ago when I tried to boot up from the battery as power source:
The first try went all the way through the apple showing up with the spinning symbol underneath it, then POOF. Then everytime I tried to boot up again it didn't even show the Apple logo, just 5 or 6 seconds after the chime, POOF AGAIN.
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Info:
MacBook Pro, Mac OS X (10.7.4), Mountain Lion 10.8 DP 4
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Jun 21, 2012
We have a Intel MAC
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with 16 GB RAM
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Info:
Mac Pro
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Jun 25, 2014
I have a 13-inch Macbook, Late 2008 model, using iOS Mavericks. While on battery power, the laptop will randomly just turn completely off, despite still having plenty of battery power left. I know it's not a calibration issue where the battery is dead but appears to have charge left, since I'm able to turn the computer back on again and continue using it.Â
Battery info:Charge Information: Charge Remaining (mAh): 606 Fully Charged: No Charging: No Full Charge Capacity (mAh): 2609 Health Information: Cycle Count: 157 Condition: Service Battery Battery Installed: Yes Amperage (mA): -1265 Voltage (mV): 10855Â
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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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