Randomly shutting down and restarting - blinking LED2
This computer is EMC 2008. I replaced the power supply several years ago and the computer has not been used that much since that replacement.
When I power up the computer it randomly shuts down and restarts itself. I opened the unit to observe what is going inside while this happens.
All of the below has been happening while the computer back is open, so there is plenty of air.
The right fan is blowing out hot air.
The left fan is drawing in air.
At start-up all 3 internal LEDs come on normally. Then the computer will shut itself down...then start back up.
I've timed the intervals between the startups and shutdowns and it's seems to be 2min:30sec (+ or -) between shut downs and startups.
When the computer shuts itself down internal LED 2 blinks in unison with the white light that on the FRONT right of the machine.
If left alone the computer will go through this sequence endlessly... starting up... shutting down... starting up ... shutting down...
Here is what I have done:
compressed air in the left fan and right fan.
removed right fan duct to check for clogging and debris - nothing in there
replaced pram battery
reseated RAM - and switched locations
Could it be the power supply again? The computer doesn't stay on long enough for me to install a CPU temperature checker.
Thanks in advance for the advice...
Is this a good question?