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Computer Randomly Shut Off, Needs Cmos Reset To Boot Again


To further explain the topic title, the machine (in sig) will randomly just shut off for no reason while it's on, or just "die" while it's off and refuse to power back on at all - no fans spinning, no post, no nothing, until i perform a cmos reset. Flipping the psu switch on and off does nothing to help the problem either. Whenever the system "dies" the clock in bios and windows will freeze and consequently display the time of death when i'm able to boot the machine up again. This started happening around monday afternoon. Current os is windows 7 since i ended up reformatting anyway trying to fix this issue - all of a sudden my legitimate windows xp claimed i had "major hardware changes" and thus needed to re-activate wga. I ended up installing a diagnostic program of some sort from at&t to figure out what was going on with m dsl connection at the same since that wasn't working either right before the restart that gave me the wga failure prompt (and i couldn't validate because of the dsl being dead at the time), and i'm certainly hoping that program had nothing to do with this. Last thing i was doing before that was just memtesting ram which didn't get any errors overnight. The red led light on the motherboard is still active as long as the switch on the psu is turned on. I can still change the clock in bios/windows after reviving the system with a cmos reset and it'll continue to work as normal. The time it takes to die again can be anywhere from 4 hours to about 20 hours as of what i've experienced so far. Only spare parts i have left is some more ram so i'll be switching that out now and hoping for the best, but in the event that doesn't work, does anyone have suggestions on possible culprits and fixes?

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What do you think? Oh and this might help:

Current status of each piece of hardware:

First stick of ram: boots, but will power off after a few seconds or a minute. Time varies. Second stick of ram: boots, lasts longer than first stick, but still inevitably powers off. Psu: god knows, could be working (it sends power to everything) but could be failing (random power offs)


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Specs of the pc

Case - coolermaster stacker
Psu - enermax noisetaker eg701ax-vw 600w with 35a on the +12v
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