Computer problem

[matrixninja]

I had something like that. Except I could still play css but on the lowest resolution and the lowest graphical settings. Turned out my video card was burnt out and thats what was causing.

It might be a hardware issue. Do you have another graphics card you can switch out and do some tests?

I have 2 graphics cards in my computer actually..A nvidia Geforce 7050 intergrated graphics card and a Nivida Geforce 210.They aren't connected through an SLI because I basicly upgraded my card.Maybe there interfering with each other since I have 2 in one system?.Also the cards I have probably arent good enough for an SLI

[ZERO]

No one is just built into the chipset it turns off when the other is in use and basically no longer exists.

[OMGBEARS]

hl2 runs fine on my Windows 7 System =P

That being said -- Zero does have a point. It may be your GPU. It doesn't exactly sound like a power supply issue unless it's an older PSU and the rail that is feeding power to your GPU is faulty or old. I would try running it on your integrated card (simple as plugging your monitor into the onboard port and changing the options) and seeing if the same issue happens. If it doesn't, then it's your graphics card or PSU rail leading to the graphics card. If it does, then it's something else.