When i'm not playing anything, my computer is just fine, but when Iplay Starcraft, my comp dies either right after I get into a game, or about 5 minutes into a game. No bluescreen, just black, no power. Just off. My CPU and GPU temps are well under there limits of temperature. Whats the problem?
NVIDIA GTS 250
Does it only happen with SCII or does it happen in any game? Game get patched recently? Update drivers recently (especially video)? If you have, then did reboots start after that update? If not, then update video drivers.
the reason why i am assuming its the psu is that when you play games like sc or mine craft it shuts down... so that narrows it down to gpu or psu for now... but you stated that your gpu temp is well under its limits... and that your pc is 7 yrs old, 7yr old psu is well over due, so lets check it... after ruling it out you can look into other things.
i've also had this issue before with my 5yr old psu... my pc would shut down while playing intense game... but it would run fine everyday use browsing, word doc, etc... so i swapped vga and it still kept happen during games... so i took my tester and what did you know my psu was giving out on me.
Im re installing windows right now for no reason other than the fact that I want to. After I do that ill get my drivers and report back. Also, couldnt a stress test failure mean a GPU failure? Why would it for sure be the PSU?
If this were a driver or GPU issue, then you would get some form of entry in the event log. Shutdown without an entry in the event log really points towards the PSU. If you haven't been monitoring voltage levels then download/install Speedfan or HWmonitor and let us know what your voltages for the 3.3, 5, and 12V rails (voltages should be +-5% of rated voltage). If voltages are good at idle, then run Prime95...monitor voltages and let us know if you get a shutdown.
you can also run occt... gpu test or psu test... prime95 won't stress your gpu, just your cpu and mem. i'm betting it will shut down on occt test... anyways you never mention what gpu card your running... nvidia cards(great cards) but power hogs...