REN:
Try checking the Power Options Properties:
1. Right-click the desktop and select Properties
2. In Display Properties, click the Screen Saver tab, then click the Power button
3. In Power Options Properties, make sure the "Turn off monitor" setting is set to Never
4. Click Apply and OK to close Power Options Properties, then click OK to close Display Properties
Let us know if that does not work.
Regards,
Doc