System stand by no longer available in power options display, nor is system hibernate. In the "turn off computer" box "Stand by" is greyed out. How do I correct this?

Go to Control Panel - Display - Screen saver - Power...
Select the "Monitor Power" box at the bottom..
Then select the Hibernate Tab...
It is prob. turned off, or disabled..
just click the check mark on it.. to turn it on..

Most of all the Power management options are available in this section..

Except for the Motherboard system BIOS which also has
Power Management functions..

but above should be what you are reffering to..

no hibernate tab available to perform this action. Any other suggestions?

thanks