Date: Sat, 27 Apr 2013 22:00:49 -0500, Jeff wrote,
Can you bring up the BIOS screen? That's usually a
simple low res text only screen. If that comes up
clearly, it may be a corrupted video driver instead.

There is no response to ESC or to F1 and I am
unable to open the BIOS. With a boot diskette in the
drive, it still boots from the hdd. Disconnecting
the hdd might force booting from a diskette. Have
yet to try that.

In any case, the display is scrambled from the earliest
visible state.

Thanks for the ideas, ... Peter E.