No Video Input In Game

When i play a game the monitor goes into sleep mode then comes up ''No video input'' This never happens any other time than part way into games and has happened on screensavers.
latest driver
fx5600
xp
phillips 17inch 1280 monitor

Didn't happen for ages with nvidia 53.03 driver installed latest driver started happening then went back to driver above and its happening on that now too!!!! ? ? hellppppp

have you checked the power options in the control panel they should be set to never...and if not check the bios setup?

Did you uninstall your old drivers before you installed the newer ones?

I take it you DOWNgraded your drivers from 53.03 to a previous version?