I've run into far too many reasons from spyware to firewalls that don't let the machine sleep. Another common cause is an out of date driver and then this KILLER PROBLEM -> http://support.microsoft.com/?kbid=296773
This fix is not available for download. Just another bizarre nail in this beloved OS's coffin.
Have Windows ME, HP Pavillion 8756C. I've recently begun having problems with my power schemes. Have them set to stand-by then go to hibernate but when I leave it on, they don't execute. When I go to power options and check it out, hit apply, then leave it on it works but just for that one time. Didn't have any problems until the last couple of months. Recently installed a new floppy drive but haven't done anything major other than that. Went thru the power options troubleshooting in 'help' but didn't find any answers there except for one of the steps that said to run 'susfail.txt' and got this message "Your computer could not Suspend or Hibernate,
because a device vetoed the Suspend or Hibernate request. " I also ran 'nohiber.txt' but it couldn't find that file. Checked for driver updates and there are none. Any suggestions would be appreciated. Thanks, Lucy