Im currently using a Emachines w3503 and replaced the video card with a ATI RADEON X1300 PRO .. i instaled the drivers for it and everything seemed to work fine the first few hours.. but after having my computer on for awhile my monitor would just shut off and id have to wait a good 10 mins after shutting off my computer for it to reboot normally again(monitor turning back on). So i just figured my card was over-heating .. so i turned off my computer and went to bed. Next morning i woke up, turned my computer on, and everything seems to work fine.. i used it for a good 30 mins and left to work.. once i got home from work, my monitor would not turn on with my computer .. and it wasnt hot or anything.. so i connected my display cable to my on-board video card and everything worked fine again.. and when i connect the display cable to my new video card.. my monitor refuses to turn on… whats wrong???