Hello
I formatted my computer last night to clean off all the kunk on my hard drive. But now (SINCE THE FORMAT) there is no video signal, the graphics card works fine and have removed it to try on-board video but still nothing. I have not yet instaled windows and the problem isn't the moniter because I have 3 and they all do the same thing. I don't think there is a problem with the connection.

On a side note, before the format I installed new graphics drivers which caused the screen to go black and not recioeve a signal. So I put the hard drive in a 2nd computer to format it ( have done it before and worked fine).

Any help is greatly appreciated

Could be a motherboard problem.
Try the GFX card in a different computer.