Cursor freezes after Standby

Compaq D5s/C1, Windows XP Pro, SP3. After I put my computer in the Standby mode, it will power up to the desktop just fine, but the arrow cursor on the desktop is frozen and won't move. I have to click ctrl-alt-del to bring up the Task Manager where I can click the appriate keys to do a restart, which defeats the purpose of Standby. Why does the cursor freeze up, and what can be done to fix it? I got this computer used several years ago and it has always done this. Also, what is the difference between Standby mode and Hibernate? I have a thick book about Windows XP and no mention is made of either.

Please do not post duplicate questions. This problem was originally addressed here: http://forums.whatthetech.com/index.php?sh…=123446&hl=