My compaq 1725 computer moniter won't turn on when I press the power button. The actual desktop is on and seems fine but the monitor remains dark without even giving the orange light that it used to.

If your computer has a video card try connecting the monitor to the motherboard video.

if no any power indicator at the front and also the fan at the power supply as will as in the mother board, it was a power supply failure.

Your new moniter may not be compatible with your computer. I have an Emachines that won't take a flat screen. I have to use a big bulky moniter because it says not connected even thought the hookup fits the back of the tower. That might be your problem. Did your old moniter work correctly?

Make sure the VGA cable is properly inserted to your pc and monitor

press in the three buttons on the monitor ( + , - , and menu) at the same time , connect the power cable, that will reset the monitor to the factory settings

if you see that is helpful please don't forget to vote me

best regards

go to properties in desktop n look for screensaver then power then look for monitor off time

well this seems the problem of your motherboard but still i will be needing more information about your system.If you need help you can visit me at----http://techbuddies-robin.blogspot.com/2009/06/free-computer-related-technical-support.html

You will need to 1. try to unstick the button on the front of the monitor or purchase a new monitor I had a Compaq 17" monitor do that to me and the button was stuck sideways Let me know if I can help out anymore

Elbtax,
Click start > right click on "My Computer" > Properties > Hardware tab > Device Manager button > Display adapters > Right click on your device and select uninstall and re boot your computer. Windows should pick up your adapter and re configure it automatically. This method should Fixya!
Good luck, and let us know how it goes.

Have you checked the computer bios?

 

In case an item was changed in the BIOS, such as the primary display device setting, use the following steps to reset the BIOS back to its default configuration:

1. Turn on the computer and press the keyboard key that enters the BIOS Setup screen key when the keyboard light comes on. The key to enter the BIOS should be one of the following:
   • HP and Compaq desktop computers that came with Windows Vista, press F10 .
   • For HP Pavilions desktop computers that came with Windows XP or previous versions of Windows, press F1 .
   • Compaq Presario desktop computers built after 2002, press F1 .
   • Compaq Presario desktop computers built prior to 2002, press F10 .
2. Wait 5 seconds.
3. Press the F5 key to restore the default settings of the BIOS.
4. Press Enter to accept the change and wait five seconds.
5. Press the F10 and then the Enter key to save the changes and exit from the BIOS.
6. The monitor should now display the first screens received from the computer (the logo screens). If not, find and download the latest BIOS update if one is available for your computer.
7. If a BIOS update was not available or the monitor is still blank, continue to the next step

Reseating loose internal components

If the PC case was recently serviced or moved, a card, cable, memory module, or processor may have become loose. When this happens, the PC might make a beeping sound when turned on. Use the following steps to check for loose components: WARNING: The edges of metal panels can cut skin. Be careful not to slide skin along any interior metal edge of the computer. CAUTION: This product contains components that can be damaged by electrostatic discharge (ESD). To reduce the chance of ESD damage, work over a non-carpeted floor, use a static dissipative work surface (like a conductive foam pad), and wear an ESD wrist strap connected to a grounded surface.

1. Unplug all cables except for the power. Write down each cable location if you do not already know where it connects.
2. With the power cable removed press the Power button on the front of the PC for 5 seconds.
3. Remove the screw(s) that retain the panel or cover from the rear of the PC.
4. Slide the side panel off from the rear of the PC.
5. Gently press down on the outside edges of cards and memory modules that are inserted into the motherboard to better seat them. Do not press too hard.
6. Gently press down on the connectors of the flat ribbon cables to seat them.
7. Replace the side panel and screw(s), reconnect the PC cables, and turn on the PC on.
8. If the monitor still displays a black screen, the video hardware may be faulty and needs to be replaced or serviced. If the monitor displays the first startup screen but does not display Windows, continue to the next step.

Try this and if it doesnt work. please post again.