ok so i had this weird video card lag, when ever i go to gmod it just stays black and doesnt change even cant CTRL+ALT+DELETE just stays like it. problem came today and i dont know how to fix it i made a format (cuz i tought there was a virus) but nothing happened, well it fixed the computer starting lag what i had sometimes (when i turn cpu on it stays black aswell) i think the problem is in video card but who knows maybe its my monitor if you need any information about my cpu then its below: Computer: Intel® Core2 Quad CPU Q6600 @ 2.40GHz 2.40 GHz, 2,00 GB of ram video card: ATI Radeon HD 2900 XT hope i can recieve some help thanks -cricket