Windows will not turn off my monitor

I am going to presume that your power option is set to power down your monitor after so many minutes?

Try playing with the settings... Change up the settigns a little bit and save them.  restart the computer and see if those settigns work right.  Then change the settings back to the settings you want and save.  I have seen power management options get funky some times and if you just play with the settings like that it will fix it sometimes.  Hopefully it will work for you in this case.

What Brand and Model Monitor is it?
Graphics Card Type?

DHave you checked the Bios to ensure the Motherboard Power Saver Options are enabled?

My monitor is Hanns-g
I have On Board graphics card

Biostar W semp3000 k8 m80  mother board

I think Power Save Options are enabled in the Bios.   I could wirte down the settings and send them if needed.

Power Down options are set to power down after 1 minute

My Power Save Options are Enabled in the Bios.    I checked this to be sure with the tech who installed my mother board

I did some research on your Monitor manufactorer and i found nothing but complaints.  Most of them unrelated directly to your exact issue but there were more than a couple people reporting problems with power management.  A notable post was a person saying that when the monitor turned off for power management it would not come back on unless unplugged and plugged back in.  Like i said i didn't see any that had your exact issue but if this monitor has a trend of issues it might also be to blame with your issue.  Have you tried contacting support for your monitor?  You might be able to find out more there.  They also might just tell you your out of luck...  If you can tell us the exact modell of your Hanns-g monitor we might be able to find out more.

This monitor worked before with Windows XP Pro and it always turned off. The problem started when I changed my mother board and re installed Windows xP

Exact Monitor
Hann Star
JW199D Model number

I would try to clear out the BIOS. Do you have a clear button on the motherboard or can you change the jumper from 1 - 2 to 2 - 3 to clear out the BIOS.

clearing bios not the solution.  what is next?

Would you please summon experts to this question.

As a test - see if running the program here turns your monitor off (which is what it's supposed to do):
http://www.koding.co.uk/index.php?page=monoff

If you really want to use a workaround as a last resort - you should in theory be able to go into Task Scheduler and tell Windows to run this program whenever the PC is idle for x minutes.

Open System Devices in Device Manager and ensure that these 3 entries are present:
ACPI Fixed Feature Button
Microsoft ACPI Compliant System
Microsoft System Management Bus Driver

Did you install the motherboard chipset drivers after installing XP?

Download and Install the Manufactures Drivewr from:
http://cms.hannsg.net/onweb.jsp?prod_no=3333333762&webno=33333333:0
Direct link to driver ZIP File: http://cms.hannsg.net/filectrl/JW199D.zip
Unzip it to your Drive,
Click Start, Click Run, Type: compmgmt.msc /s , Click OK

Click on Device manager, Monitors, Click on the Default Monitor, Right Click and Click On Update Driver.
 Click intall from a list or specific location (Advanced) , Next.
Clcik on Include this Location in the Search, and Browse to where you unzipped the above.
Next it will Search and find the driver downloaded.

That Should resolve the Issue.

Wes

The monitor off program did not turn off my monitor

WillComp
All those are present in system devices

That's good, but did you install chipset drivers?

WMiller

I downloaded and unzipped the driver.   There is no monitor under device manager.

Willcomp.

No, I did not install the Chipset drivers.  No software came with my mother board.   Where can I get the Chipset drivers?

Need to know exact model of your motherboard. It is silkscreened on motherboard itself. Model should be K8M800-XXX. If you need help to identify the model, use SIW.
http://www.gtopala.com/siw-download.html

The information you provided earlier is not a valid Biostar model.

Mother Board is
Micro Star
MS 7255 v2.0

(computer store that installed my motherboard gave me the wrong information)

I think they also did not install Chip Set drivers after they installed Windows. They did not give me any software.

I think I have an incorrect driver loaded
I found a Yellow Question mark under Device Manager

Other Devices

Video Controller (VGA compatible)

I have it disabled but I don't know how to unistall it.   Could this be my problem?

It very well could be your problem since it is the video driver in question.  Can you tell us what kind of video card you have?  Is there an extra card you have connected to your motherboard (which would be your video card) or is your your monitor hooked up to some on board graphics (connected right to the motherboard).

I have an on board video card.

I believe one of the board modells at this link is one of yours.  
http://global.msi.com.tw/index.php?func=searchresult&keywords=7255
Find the one that you have and i would download and install all of your drivers to make sure everything is 100% up to date.

Ok, all my drivers are up to date now.   Moniter will still not shut off.   I believe it is because of the incorrect VGA driver that is showing a Yellow question mark under device manager.

the VGA  driver should have been installed with all those other drivers... maybe you installed the wrong one?  We need to find out which VGA driver you need so we can get that installed correctly.  Are you sure you downloaded the right motherboard model drivers with the correct video drivers?  Do you know what kind of graphics your motherboard uses?

I installed a wrong driver.  I had a video card on my old motherboard and installed that driver on my new motherboard that has on board video card.   I do have the correct drivers installed for the new motherboard. I used the live update from the manufacter website to install the correct drivers.  but I think my disabled driver is causing the problem.

Can you right click on the yellow driver and select uninstall?  Did the driver leave any software component in your add/remove programs list?  Usually ATI or Nvidia will list the driver up on add/remove programs and you should be able to go there to uninstall the driver.

If I right click to unistall the driver comes back when I reboot the computer.

I do not understand how to find a software component at ATI or Nvidia.  I found the website but that is all. I don't know what to do from there.

go to control panel | add/remove programs... see if in that list there is something by nvidia or ATI or any other kind of graphics drivers beside your motherboards drivers and uninstall them.

I have software from Via Technolgies in Add/Remove programs.  Would that be the software that I should uninstall?

How can I tell what driver it is in ADD/Remove programs?

The software in Add Remove programs is Via Platform Device Manager.

Whatever you do don't remove that Via software.  That is important to your system.  Do you know at all what kind of graphics card you had that you installed that driver?  If you can find out what kind of graphics card you had then you should be able to find out what you installed that you need to remove.

We may be at a dead end here.   The computer store that installed my mother board threw my video card away and I  don't have the software for it anymore.    I only have the driver installed on my computer.

Go up to link for motherboards and tell us which motherboard you have (800 or 890) and we can link to video drivers. If shop installed XP fresh, old video drivers should not be present. The yellow question mark is probably related to on board video.

My motherboard is the 890.

I installed video driver for my old video card by mistake. However, you are most likelly right about the yellow question mark coming from my on board video.

Download and install this driver:
http://global.msi.com.tw/index.php?func=driverfile&dno=2456&i=0

cannot install
s3iscfg.log

Run SIW and see what video adapter is present.

Go out to this website: http://www.belarc.com/products.html
 And at the Very Bottom is a Click Here to Download, Download it and install it.
Then Run it, On the right side will be a Display Header which will show you what Video Adapters are active.  If you go back into Computer Management ie: Click Start, Click Run, Type: compmgmt.msc /s , Click OK then again click on Device Manager, then Display Adapters, you can Right Clickand disable the one you do not want to use. There should be a Monitors listing that shows all the monitors the system is using. If there is not then Click Start, Run , type: hdwwiz.cpl, Next, Yes, I ahve Connected the Hardware.
Next, Scroll and Click on Default Monitor,  Next,  Finish.
Wait a few seconds and the Troubleshooter will Launc, Choose: I cannot install my Monitor.Next,
Follow the Onscreen Instructions. BUT when you get to the point of installing the Driver choose the
Install from a List or Specific location (Advanced) , Next, Then Click on the  'Include this location in search' , and Browse to where you unzipped the download before. then Ok and Next, then you should be able to click on Finish.  This should install your monitor and the issue.

Wes

I was able to follow your instruction.  There were no active display adaptors.  No monitor detected.
Then I ran hdwwiz..cpl    There was no default monitor listed.  They only thing listed was the Yellow Question Mark Display that I had disabled.