Monitor won't wake following logout or hardware suspend

[Rock Doctor]

I have recently reinstalled Kubuntu Natty on my new HP desktop machine (AMD Athlon II X4 645 Processor with ATI Radeon 4200 graphics adapter). The system is working great, but for the fact that if I let the monitor sleep, or if I simply log out, I can't wake it up again (mouse click & wiggle, and space bar fails to wake monitor). This has contributed to the file system being corrupted . . . twice. The system can be shut off and rebooted by pressing and holding the tower power button. I have tried shutting of the monitor power saving features, but that didn't help either. Does anyone have an idea where else to look?

[oshunluvr]

How did you try and disable the powersaving?

Open a terminal and type

xset dpms q

the next to last line of the output should be

DPMS is Disabled

If it isn't, type

xset -dpms

and check again. If this doesn't fix it, you need to start looking into dmesg and Xorg.0.log to see what might be causing the shut-off. If this does work, you can put that command into /etc/rc.local so it's executed at every log in.