Push the power button.
You can reset the Windows XP by performing a Restore operation.
Windows XP switches off the computer's monitor Windows XP switches off the computer's hard drive
Usually, the standby and hibernate options become inactive on Windows XP due to the system missing graphics drivers. Another possible reason is if these options are disabled in Control Panel.
restore
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Hibernate, Standby
There are several ways to get to the Windows XP system restore. The easiest way to do so is by going to the help center in the control panel. Another way to access the system restore feature is by booting the computer with the Windows XP CD.
Start > Control Panel > Power Options
click start then shut down. there should be a mode called standby with a orange box with lines in the shape of a circle.
Backup and Restore Center
It allows you to restore your computer to a previous state incase of a system problem.
system and registry settings