Resume after Hibernate or Standby fails. Power on after Sh..

I have had this problem for more than a year and have tried all the pèossible fixes found on the web, including microsoft patches, magic swear words and god knows what. Eventually, I stumble on the sollution by chance. This may not work all the time, but in my case (Windows XP, SP3) it did the trick:

1-right click on my computer
2-go to the hardware tab
3-click on device manager
4-Go into Universal Serial Bus Controler (by the bottom)
5-expand it into a list
this list should be littered (that was my case) with USB-something, often some left overs of badly installed USB devices.

6-remove them all, one by one, don't worry, they will re-install automatically when the dvice is reconnected (no need for the installation CD)

Normally your computer should then resume from hibernation.

Hope this tip saves as much time as I have lost,

Cedric

To anyone else still tearing out their hair trying to solve this (as was I), here is the solution. The problem is most likely rootkit malware attack.

To check and remove rootkits, download and run Kaspersky's TDSSKiller:

http://support.kaspersky.com/downloads/utils/tdsskiller...

I ran this. It found one infection, quaranteened the file, rebooted my computer, and hibernation now works.

After countless attempts to fix hibernation, this was the only solution that worked for me.