Standby question

[The_Bullet]

Hi all. If I am going to be away from the pc for 30 mins or more (but not finished for the day) I usually let my monitor (crt) go into standby mode. However recently it has stopped switching off. I need to do a reboot before the monitor will switch off to standby. The exact same processes are running both before and after reboot. I have added no new software recently other than av updates. There are no open programs running, and the screen saver will come on fine, so there is nothing interrupting that. I am running windows xp. Has anyone seen this before or have any ideas ? Thanks....

 

[The_Bullet]

Thanks for the replies guys. It's an ATI card (X850xt) and the settings are fine. A reboot cures all, even thought there still is exactly the same processes running as before the reboot. Also what is puzzling is that the screen saver works fine - nothing is interrupting that. A frustrating one . Maybe it's time for a format....