Thanks to all.
BIOS was (successfully) flashed with the latest available update with no
change to monitor behavior.

"Johnny_1" wrote:

1.4 Ghz Pentium 4 - Windows 98 standard

Computer goes into standby and will seem to resume, however monitor stays in
low power mode. Also mouse will not resume computer from standby.

I'm reconfiguring an old cpu with no budget
All hardware have updated drivers and monitor is energy star.
Thanks for any suggestions