here's my case. i recieved an error code : stop: 0x0000007F (one time)
since then i have not been able to use my computer.
everything sounds like its running, but my monitor as soon as it turns on says:
self test b
your monitor is working g
check the video cable and pc r
the monitor says this whether i have the computer on or just the monitor.
any suggestions?

You might try booting into SAFE mode and set option: Enable VGA mode. Will attempt a Safe mode with using the Windows generic VGA driver

/ * edit */
ooops. but just realized you can't see your monitor image at all?? Other then checking cables etc. you may need to try borrow a friend's monitor to test