Power manager is available for desktop else
(most newer desktop do), I have been caught
with peripherals shutting down before.
Depend on the computer it may have it’s own
power manager or windows manages power
settings; usually under “Display property –
Screen saver” there is a “Power” tab ; set
power scheme to “Never” for all options and
try again. In some computer the bios set up
has additional option regarding built in
peripherals power settings.