Monitor sleeps while in use.

It sounds as thought the APM on the MB is whacked. One thing to consider on some MBs APM has to be enabled before windows can manage it. You could setup your power schemes but they do "whack a do" things with APM disabled in the BIOS. I would try this before you go to hardware. If that does not fix it, I would suspect the MB has some issues. Depending on the maker of the MB they may have a BIOS rev to correct it also.

Does the PC go dead, or just the monitor?

You can check this by using the keyboard sequence to shut down you program, and shut down the PC.

Practice the key sequence, and write it down if needed.

If the PC shuts down, you have 3 likely suspects:
CPU fan
CPU
Power supply.

You can run a program called motherboard monitor form www.livewire.com to check if the CPU is overheating.

If the CPU is not overheating, I have seen a number of power supplies recently that are peak rated.
Ihave seen a 400 Watt supply that actually is only a 250 Watt supply.

Another possability is that the video processor is failing.

Chas

In addition to the excellent answers above, you might check the monitor control settings for power management options. Be sure your display adapter is fully seated in the expansion slot. You state your power management options are set to "always on"which means you have power management enabled, not disabled! The default options for the power management scheme "always on" is to turn off the monitor after 20 minutes. For purposes of trouble shooting power management in your new system I would disable all power management/APM options in the bios, monitor, operating system. Be sure all expansion cards are fully seated and re-check all cable and power connections. Depending on how many devices you have plugged into your system be sure the AC outlet can handle the load. Power hungry devices such as CRTs & laser printers generally should not share the same AC power connection. If your PC has an optional AC power outlet on it and your monitor or any other devices are connected to it, disconnect it and find another power source. One last item, does your PC have a good quality power supply rated to handle the power requirements of your system? New systems usually require at least a 300W power supply or better. Good luck, hope this helps!

I think the Chas is correct with his answer. I have seen this and it turned out to be the cable between the monitor and the video adapter. This sounds more like a connection problem--check the cable when this happens by "jiggling" it at the back of the monitor and at the connection point on the video adapter. If the video comes back or flickers at all, it's in the cable or the junctions. Make sure that the video card is seated properly. I doubt that re-installing your OS is going to help you except to give you good tech experience. If the connection is testing OK, then perhaps it's the power supply in the monitor (not likely the PC if you can do as #3 suggests and keyboard out of windows).

Try the monitor on another system if possible to see if it does it there. Also try another monitor on this system and if the other monitor does it, then it's pointing to the connection or signal transmission once it enters\exits the video adapter>>MB>>etc.

Please post a comment when you fix this to let us know where the problem turned out to be.
Good luck!

This is the solution from a friend of mine about the issue. He did this himself while I watched.

1. Enable all APM function [in BIOS]
2. Disable LAN wakeup
3. Clean install W2K with all updates
4. Restart the system several times [to make the system get use to it - he said]
5. Set the power management to "Always On"
6. Disable screensaver
7. Leave the system on for overnight.

The result:

My PC went out [same issue] on first day. On second day the problem just GONE! I don'tknow why... Now the PC is cured, somehow, magically...

This question was closed by the author