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I have a dell dimension E510 with windows 7 ultimate 64bit. Recently my pc keeps going off after being left on for about a day. I would usually just leave it on indefinitely unless i had to reboot or for some other reason but as of recent it stays on for about 12 hours max and jus goes off with a blinking amber light. I then have to put it off by pressing down the power button for a few seconds and leave it off for at least about 6-12 hours and if i do try putting it on too early it will go on but just shut down with the blinking amber light after a few minutes. I'm not sure whether or not this is an issue with the motherboard or the power supply. I recently had my motherboard replaced due to the pc not going on at all. Any help would be greatly appreciated. Thank you in advance.
 

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Could be an overheating issue or a PSU going bad. After running for a couple hours, do a reboot, go into BIOS (usually by pressing F2) and record the temps and voltages.

You could also unplug it, open it up and check out how clean the fans and heatsinks are, though I would have thought a new mobo would have caused a good cleaning.

Dell says a blinking amber light indicates a power supply problem.
 

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Your symptoms commonly relate to a failing PSU
Has any hardware been added to the orignal configuration?
Do you have or can you borrow a known good PSU to try?
 

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You haven't mentioned it in your post but I was wondering if you have checked your power settings in Windows 7. CPU could be programmed to shut down after 1 day, etc. Just a thought.
 
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