I cannot get the monitor to turn off, using the power button. I have to unplug the monitor to turn it off. ever heard of this problem before?

Get monitor out of burn in mode by unplugging the power to monitor then while holding down the power button on monitor plugged in the power cord to the monitor all while it is connected to a running computer. Turn the monitor off with the power button. When press the power again the burn in mode should be gone and the monitor should display the computer

If it doesn't turn off by holding the power button down for 10 seconds, then it cannot be turned off by the power button alone, like most modern lcd monitors. Most modern monitors goes into standby mode. To completely cut power, you must unplug the power cable.
I've enclosed a link to the install manual for reference.
Samsung SyncMaster P2050 User Manual Page 7

SOUND LIKE YOUR POWER SUPPLY. OPEN THE SCREEN AND LOOK FOR ANY BLOWED UP CAPS. AND REPLACE WITH SAME

Press and hold the power button on the monitor until it turns off. If you press and hold the button for more then 2 minutes or so and get no response, unplug it from the power source. Then press and hold the power button down for 60 seconds while it is unplugged. then plug it back in and turn it on. that should solve your problem.

first guess is the motherboard is bad

a few things you can try:

unhook the monitor from the computer and test it on another computer. If the monitor works then its most likely the motherboard.

leave the computer unplugged for a few hours then plug it back up and give it another try just in case it overheated.

have the computers power supply tested as a bad power supply can cause all sorts of issues.

other than that you are down to a new motherboard and or a new computer.

it sounds like a capacitor blew from the inverter board.. if u can open it it should be obvious which one the messed up..

I didn't have the monitor connected to the computer, and that's why the power button was unresponsive. After connecting it, the solution above worked for me.(My KVM switch was set to a computer that was turned off)

Resetting the TV
If the buttons on the remote AND the buttons on the TV case do not work (channels do not change and you cannot open or navigate the menu), the TV has stopped responding. Reset the TV as follows:

NOTE:
Some TVs have a reset button. If available and accessible, try using the reset buttons before using the steps below. Using the reset buttons can save time.


1. Unplug the TV power cord from the power outlet.
2. Unplug any connected devices (DVD, Set-top boxes, etc...)
3. Press and hold the TV power button for five seconds.
4. Plug the TV power cord back into the power outlet and turn on the TV.
5. Open the on-screen menu to confirm that the TV is responding again.
6. Turn off the TV and reconnect the devices.
7. Turn on the TV.

hope this may help;

Regards,
VOTIT

I had this same problem with my ViewSonic LCD monitor. I tried turning the monitor off from the button on the front, and tried changing the settings for the monitor. That didn't help. But then I unplugged it from the power source, and the streaks immediately vanished!

i fixed this problem by unplugging the monitor, unplugging the video cables. Then hold down the power button while plugging it back in. Release power button and then press power button for on. It worked then. I got the icon for no signal, i plugged back in my monitors. Sceptre X9W