How old is your computer? For standby and hibernate to work, your mobo musp support ACPI.
If your machine is ACPI compliant, the settins might be disabled in the BIOS. Go to 'Advanced Power Management' in your BIOS and enable 'ACPI compliant OS' setting. Now try enabling standby and hibenate.
If this doesn't help and the BIOS is ACPI compliant, you may need to reload the motherboard drivers. These would have come on a CD with your motherboard.
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Finkus Stinkalotus
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since Jun 2005