Which OS are you using?
If you're using XP, go to Start->Control Panel->System->Hardware->Device Manager. Are there any Exclamation marks or question marks or anything that seems out of place? What's listed under Display Adapters? What's listed under monitors? If you double click on your video adapter (under the Display Adapters tree), what version driver are you using (under the Driver tab).
If you're using Win 95/98/ME, go to Start->Settings->Control Panel->System->Device Manager and answer the questions above 
Can you take your video card to another computer? Do you have a spare monitor? The best thing to do is actually find out what is wrong. I'd imagine the video card but there are a LOT of different things it could be (OS, virus, drivers, communication, video card hardware, motherboard).
Hope this helps.
__________________
I'm a professional web developer. I'm good with PHP, Perl, Java/JSP, some RoR, XML, Javascript (AJAX as well), (x)HTML, CSS, etc.. Validated code is good; fully cross-browser code is better (you comply to your users and the software they use, not the other way around. Sorry!)
|