Karmic upgrade - now no signal to display
I recently upgraded from 9.04 to 9.10 on an IBM Intellistation Z Pro (64-bit).
Install went smoothly.
Upon restart, everything works fine up until the log-in screen. The normal hardware checks all run and the new white Ubuntu symbol appears but when it switches to the log-in screen, a "No signal" message appears on the display and the green power light goes orange.
I can still log-in remotely from another machine and access all the files and drives, run jobs etc., so the machine did start-up properly, it is just an issue with the display.
I would greatly appreciate any clues on how to fix this situation.