Sorry can't find power mangment option.
what does that mean?
It means you're system cannot get out of standby by using the keyboard on your computer then. Seems kind of odd to me. Every PC & notebook I have in my home has that option.
device manager is in the harware tab of ur system properties. press the windows button and pause break button together, then go to harware, and go to device manager.
Not really sure why you posted that above, is beyond me. Anyways, If you really want to do it faster;
Click Start, click Run, and type: devmgmt.msc