i had been searching for fix with windows 7 sleep problem.. it cant go to sleep everytime i hit the sleep button.. it was a nightmare for me.. but after searching so many sites and fix… i found one site that solve my problem.. from windows7forum..
Computer Won’t goto sleep ?
here is why and how to fix it
By default Windows 7 has media sharing turned on ( for xbox , ps3) ect
this pervents it from going into standby Mode
The Fix is Simple
Open control panel and goto
Power Options > change Plan settings > Advanced Power Settings
Allow hybrid Sleep > disabled
Allow wake timers > disable/enable try both settings
USB selective suspend > ENABLE
+When Shareing media [ This is the critical one ]
Set to allow the computer to sleep