Thanks for responding, fellows.   My computer is an HP m9040n with a nVidia GeForce 8400 GS card. The case has never been opened, but it would be my guess that this is a separate card rather than integrated.

It is not just the monitor. In a way, I wish it were as that is easily fixed. One of the early things I did was to attach another monitor, but with the same result.

Since I read your suggestions, I have done some reading and studying, and have decided this is not too big a stretch for my expertise level (low). One thing I did read that caused a bit of consternation was to uninstall the drivers before the changeover. That makes no mention of how to do so without being able to see the screen!

It does seem to me that exact duplicate replacement would mean uninstallation would be unnecessary, but that is just an educated guess. I have checked and a replacement nVidia is available from Amazon for about $50.

Well, that is how far I have progressed with my thinking at the moment. What do you think?