A while ago I had the option to hibernate the computer. Nowadays, this option disappeared. In fact, even the standby option (when click the turn off button) is greyed out. I have tried the "powercfg -h on" switch and no success. I'm also missing the hibernation tab in Power options.
My system is Windows XP Home Edition, SP3
In the device manager, I have a yellow exclamation mark near the Video Controller (VGA Compatible), under "Other Devices" but everything else looks normal. Could this be related? If yes, what should I do? If no, what else could it be?