More info, let's see. Computer was in shop 6 months ago having windows xp reloaded in anticipation of being a 'helper' computer for Towing business. Just hooked it up, added DSL and all was fine. Used a couple of times to check email and suddenly wouldn't boot. Lights on cpu are on but blank screen on monitor. When I press menu button on monitor the box saying 'DPMS power saving mode' appears. Shut the power down and back on MANY times, pressed keys MANY times and finally left it off. Three weeks later, today, turn it on and it boots up nicely, all is well. 15 minutes later enter the room after being idle and blank screen is there. Have shut it cown with master off/on switch and completely shutting down the power strip. When I power up, can't hear anything from cpu except the fan and monitor displays dpms box.