Check your connection from PC to Monitor if the monitor is on standby the led should be on. Try a another monitor to check that the graphics on the pc are still working this will determine if it is a problem with Monitor or graphics card.
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The HP is a flat screen monitor used with many desktop computers. When the LCD on your HP monitor goes white, it is an indication that your monitor's inverter board has gone bad. The inverter board is a small circuit board that transfers power from the monitor's main circuit board to the LCD screen. Replacing the inverter board means dismantling the HP monitor.
1. Power down your computer and unplug the HP monitor cable from the back of your desktop. Disconnect the power cable from the back of the monitor. Relocate the monitor to a flat work surface. Place the monitor with the screen facing downward.
2. Remove the Phillips-head screws from the monitor's base stand and from the back cover. Lift the base stand off of the monitor and remove the back cover. Peel away the foil from inside the monitor around the internal circuit board.
3. Locate the inverter board near the bottom of the monitor's casing. Unplug the power cables from either side of the inverter. Loosen the Phillips-head screws from the inverter board. Lift the old inverter out of the monitor's casing and set it aside.
4. Place the new inverter inside the monitor. Replace the Phillips-head screws and fasten it in place. Reconnect the power cables to the connectors on each side of the new inverter. Replace the foil around the outside of the main circuit board.
5. Replace the back panel and base stand, and their retaining Phillips-head screws
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Unplug the T.V. and hold the power button down for 30-60 seconds. Plug the T.V. back in and try powering on. If it still doesn't power on then you may need a firmware update, or something on the board has gone bad such as the power supply or capacitors. You can take off the back of the T.V. and look for any swollen capacitors on the board and see if the power supply looks ok.
You will need a phillips head screwdriver. There are four screws on the back of the TV that go into two rather long "legs" that go a few inches into the bottom of the TV. Just remove those screws and lift the TV off the stand. If you have your owner manual it will show you exactly where the screws are located otherwise just look for the heads of phillips head screws.
I had a similar problem with my Phillips 42 in. LCD HD TV.
Here's the problem. The Power Supply Board. I opened my TV
up(warranty was up of course) and found several bad capacitors.
Phillips and several other companies were sold capacitors that although
were highly rated failed within 5 years because of a lack of
preservatives. All sorts of electronic equipment is now being effected
due to these defective capacitors.
1. Take it in and have it fixed
2. Open it up, check the board for faulty capacitors(bulged or leaking) Buy a new Power supply board and install it.
3. Remove PSB, remove faulty capacitors and replace with compatible new ones.
First try to Reboot PC in safe mode by Tapping the F8 Key. Once you get in at desktop.
Open the MSCONFIG, Start --> Run --> msconfig--> then go to Startup Uncheck all the entries then try, to boot normally.
Let me know if you need further assistance.
Best of Luck
We purchased a phillips plasma 50" in july 06 and it cut on and off 5 or more times a day I called phillips customer service they told us it was due to the cable company they came out and changed the tv jack gave us a new box and tested the lines said everything was ok. The problem still kept happening got back to phillips and they sent us a flash drive to update the info in the tv. still kept happening told us it was due to tv being sensitive to power flutuations. well we are now 5mths out of warrenty and the power board blows up! phillips will not do anything to help the person I spoke with admitted we were given bad advice the bill was estimated at over $500 so if I were you if its still under warrenty make them send someone out to look at it, Reading up on phillips tv complaints this seems to be a common thing By the way phillips customer service sucks dont rely on them to help you much. good luck