squeeze installation: monitor problem?

[Charlie <c-blair@illinois.edu>]

   I have an i386 machine that ran etch and was
upgraded to lenny.  After a squeeze upgrade did
not work, I decided to install from scratch,
using a CD with netinst.

   The intallation seemed to go all right until
the reboot.  At that time, my monitor went completely
dark after displaying a "video out of range"
message.  A different monitor did not work either.

   Perhaps a clue to the problem is a message displayed
at the very beginning of the install:

8254 timer not connected to IO-APIC.

   Thanks for any help!