Computer Keeps Losing Power

I did some work on a friend's dell last night and today he said it keeps turning off. I noticed this once last night, but wasn't sure if it just went to sleep or what. When i installed windows 7, the first attempt i got an error during installation that said something like "windows cannot configure this machine for windows". I started over and it worked fine the second try. I turned the sleep function off in the power settings "when to put the computer to sleep" = "never". I know it's actually losing power completely and not just shutting down, because when you turn it back on, it goes through the post screen and then when windows starts to load it gives you the error screen about "start windows normally, last known good settings, etc" and i just pick "normally" and it loads fine, any ideas?

I would say psu because it's obviously just lowing power abruptly so i can't think of anything else that would cause that. I can't imagine that adding a ssd would cause the psu to be overloaded
Only other thing i can think of is the ups, i noticed he had some geek squad ups management software installed before when it had xp on it, so maybe the ups is turning itself off if it's not getting software input - i'm gonna try plugging it directly into the wall

Update: well apparently i did not turn the sleep function off, he just did that so now we will see
Update2: apparently turning off sleep fixed the problem

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