Sorry for being abscent for so long, my computer is kinda custom made has a 500GB Hitachi SATA hard drive, 2GB ram (1GB ram x2 slots), a Biostar nVidia 9400 GT GeForce video card and 610w power supply, intel core 2 duo processor and respective G31D-M7 motherboard; so yes it´s pretty much new, the hard drive, processor and ram might be the oldest, I bought the computer in 2008´s january and this year´s april the motherboard it had fried the integrated videocard so I replaced the motherboard, the videocard and the power supply.
At first I believed it was my ups because it turned the whole system down and it would stay that way, sometimes while doing something (playing warcraft or talking to someone on msn) and other times just a few minutes after coming from being abscent from some 30-60 minutes and without having any application opened; so I decided to switch it for another UPS (although not a better one in my opinion, but I had no other to try on). It stopped giving me trouble for a while but then it started failing again, only instead of turning off completely it would restart; the first time it happened I was in windows 7 trying to attach open source data (from Open Office´s Word) to an email and had the file opened when it restarted, so I thought it could be due to open office being running while trying to attach data; I booted into Win7 and tried again but it restarted while attaching the document this time not while running the other aplication, so i thought it was a Win 7 issue and booted into XP and managed to send it.
About 2-4 days later I experienced the same restart problem again in win 7 and I had been told it could be due to Win 7 since it´s still in beta state (alhough it´s the RC I dont discard the possibility), anyway II tried again to boot into windows 7 and got a sreen where it said it could be due to hardware or software error and that I could either run a test or start normally, start in safe mode, etc. I chose the test but it restarted in the middle of it so I booted into XP and just after a few moments it restarted again while still begining to run startup programs, and all went downhill from there, I tried to boot again into XP but it restarted even while on the bootscreen so I decided to simply shut it down from the on/off button before the situation got worse.
A few days after I started up my computer and got to the screen in win7 that recommended the test, since it was freshly started it ran the test without problem but showed no problem fix only the possibility to send a notification to windows, it showed the same restart problem only after some 4 hours later again and I ended up turning it off from the button and took it for a check. Today I got the result: No restart, although it has been on for full days, I´ll pick it up tomoroww, I dont know what to think, I still believe it could be the power supply wich heatsand Im unsure about the power lines, I think I will try taking off the video card and later try a new power supply and another (new) UPS, I guess I´ll let you know later how it goes.