While we are talking about video problems after a HD swap...

I have 2 computers with the HDs in pull-out trays. I installed 7.10 onto
the one with an AGP display interface.

Putting the HD into another computer, a Dell Inspiration 4400 with a PCI
interface, the video is way out of sync.

This is probably because the computer Ubuntu was installed on a computer
with a 22" wide-screen 1680 x 1050 LCD and the Dell has a 19" standard LCD.

Is there a simple cure for this? May be hook the wide-screen to the Dell,
make the video adaptor corrections to say 1024 x 768 and then hook-up the
19".

Is there a way to get Ubuntu to back-down on the resolution while it is
booting up? Or may be do it after booting up by and a few keyboard strokes
that does not require seeing what is on the monitor.