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I have a windows 7 x64 machine which sometimes (not all the time - no discernable pattern) when I tell it to sleep turns off the monitor but never powers off the machine (left it overnight). It then won't wake up, tried the keyboard, mouse and power button.
EDIT:
to be clear the machine turns the screen off like it is going to sleep, but then the fans/disks/cpu do not turn off and the power light on the front of the machine stays on. Once it is in this state it can then be 'woken'
/EDIT
My only option seems to be to hard shut off and reboot.
Why might this be?
2Have you tried updating your drivers? There is probably something preventing it from successfully turning off all devices, the system thus hangs while trying to get to sleep. – Tamara Wijsman – 2010-08-12T12:03:19.197
I would agree with @TomWij - an application perhaps? When in sleep you would need to hit the power button to waken it, AFAIK keyboard and mouse would never wake from sleep? – MrWhite – 2010-08-12T12:09:15.280
if you set in the bios that USB devices can wake from sleep then yes, USB mouse and keyboard can wake the machine, assuming it has gone to sleep correctly. – Sam Holder – 2010-08-12T12:37:37.357