I am having problems with my monitor!
The PC works fine for an unspecified period but then all of a sudden the monitor will flash up the message "No VGA Input Signal" and will then go to sleep. There seems to be no way of getting the PC to wake up again once it's done this and I'm left having to turn the whole thing off.

I've looked up similar problems on various sites but other people only seem to be getting this problem on start up whereas mine works fine for maybe several hours but then suddenly stops.

Any ideas? Would be much appreciated!