Why is my iMac shutting down randomly?
Hello everyone!
4 months ago my 2008 imac 8.1 20" EMC 2210 started shutting down after it had been working for about one hour.
Right now its shutting down after 30 minutes, but sometimes much faster..
When is shuts down, first the screen goes black, but the system keeps on going. A couple of seconds later everything just shuts down and the computer tries to reboot a couple of seconds later..
The diagnostics LEDs, all 4 of them are on when the iMac is running. As soon as the screen goes black, the 4th LED goes out. After a couple of seconds they all go out, except for the first LED.
I have done the following:
- Cleaned the fans
- Checked the RAM
- Booted in safe and single user mode
- Performed a hardware test, no issues
- Hardware test uitgevoerd, geen issues
- Tried smcFancontrol for keeping the CPU temperature low
- SMC reset
- PRAM reset
None have showed any improvements.. Although when using a fan on the back of the iMac it seemed to last a bit longer..
Does anyone have an idea?
Thanks!
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9 Комментариев
Is it stable in safe or single user modes? If not try dimming the display brightness to as low a level thats possible that you can see see the display. Does the system run longer?
из Dan
Hey Dan, its not stable in single user or safe mode. I'll try to dim the screen and check it! Thanks
из Thomas
Okay Dan, lowering the brightness didn't have any effect on the problem..
из Thomas
Running advanced AHT once is often not enough run it 2 or 3x in succession. Also have you looked at your crash logs? Crash logs can often point you in a direction, or rule out an erroneous assumption.
из originalmachead
Do you have access to an external Firewire HD which has a working system on it? If you do alter the startup disk to it and restart running off it it. Is the system stable now? If not, its starting to look like either a power supply or logic board problem.
из Dan
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