There’s an option in Windows XP power management that allows you to set a period of time, after which your monitor will be turned off. (which is more like Standby given that a shake of the mouse will awaken it).
Here is a way about creating a shortcut that will allow you to do the same?
OK you can have two ways to do this
2.Another way is to download a standalone program that is built for this
Check out the page http://www.nirsoft.net/utils/nircmd.html
1. Download the ZIP file (link is at the end of that page).
2. Extract it to a temp folder.
3. Run nircmd.exe file.
4. Click “Copy to Windows directory”, click Yes.
5. Now, right-click desktop (or inside any folder like Start Menu, Programs, Quick Launch) and select New>Shortcut.
6. Enter “nircmd monitor off” or “nircmd monitor low” (no quotes please) (I don’t know the difference between them. Experiment.).
7. Click Next, and enter “Turn Off Screen” or anything you like as shortcut name. (no quotes). Click Finish.
8. Right-click the shortcut you created, and click “Properties”. Click “Change Icon”
9. If a message “The file %windir%\nircmd.exe contains no icons.” (or similar) appears, click OK.
10. Choose a nice icon (In WinXP, I use the “blue power icon” of shell32.dll file).
11. Click OK. Click OK again.
12. Try out the new shortcut to get a feel of it!