before i go on, YES i read the previous posts on this and nothing works. specs: amd sempron 2.00ghz 1.5 ghz ram total: 1 stick of 1024, and 1 stick of 512 ati radeon 9600 windows xp sp2 i can home one day and it was on, like it usually is. temparature of cpu is normal. i boot up a video game (a steam app) and it reboots. i think oh, man, this isn't good. i log in again and reboots. log in, reboots before i can log in. reboots again, get into windows, stays stable for awhile until i try to run my game. reboots. i try to troubleshoot in the display properties but it reboots suddenly. i go to work, come home, boot it up, and before it gets to the windows load screenm, it goes black (monitor is still green light). i try rebooting a couple of times but can't get past it. any idea what this is? my computer was VERY stable until this, not a problem ever. i didn't go cheap on any parts, either. any suggestions would be appreciated. and yes, i did read the posts relating to this, but most didn't work and deal with a frozen screen after the XP loading screen. thanks in advance.