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.
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Hibernate, Standby
restore
Step 1: Partition the hard disk. Insert the Windows XP CD into your CD or DVD drive, or insert the first Windows XP Setup disk into the floppy disk drive, and then restart the computer to start the Windows XP Setup program. ...Step 2: Format the hard disk and install Windows XP.
Start > Control Panel > Power Options
If it still boots, go to System Restore and roll it back to an earlier point. If you want a full reset, you'll need the Windows XP installation CD since XP doesn't have the built-in "Reset this PC" option like newer versions of Windows.
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