Quote:
Originally Posted by illicitstylz
Guess i'll have to go out and buy a PSU, damnit.
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Follow TekDragon's advice first: unplug the power connectors from everything non-essential: all drives (HDD, optical, floppy, etc.), all "extra" fans, anything else that has power connections (other than video card). Remove any non-essential cards as well. See if it starts and runs... if so, then start by plugging in JUST the system drive. If it boots at that point, it's most likely your power supply.
They don't "lose power over time" but it's possible an internal component has failed that's causing it to either shut itself down under load, or to simply no longer be able to produce the needed output.
If those steps don't help, then the PSU probably isn't the cause of your problems, so you can save yourself running out and buying a new one.