|It's probably not something that clearing the cmos would help. It sounds like a problem with the video card. Can you temporarily swap in another one and see if you get the posting screen?|
Or, does the monitor have on-screen programming where you can specify accepted resolutions? The posting screen is probably 640 x 480. I've never known a monitor to block that resolution so I doubt that's it. But you know the capabilites of yours better than I do.
Help me Jebus!