I have a similar problem: blank screen during bootup & after.
Inherited an older computer (owner said it was "dead", which means a challenge to me! <grin> ) that sounds like it's booting up normally, but the display never shows the BIOS bootup process, nor anything else! I can feel the HDD spinning up, the read/write light flickers, and the usual things that happen during POST seem to occur. But, nada on the monitor!
Any brilliant ideas of the problem? I suspect it is a virus that has deleted video driver files or, worse, Windows directory/content.
If you have any idea of where to turn for info that would be great! Or any useful suggestions. My searches haved turned up NOTHING...