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Sorry this wont help you much, but may put you out of your misery trying to repair it.
The LCD panel has failed. In particular the driver tabs that connect to the physical panel have failed and there is no way to repair them.
The only soloution is to replace the entire panel, a cost that would be close to if not more then a new TV of the same size.
I would put it on Ebay for parts (powerboard, logic board etc), and use the money towards it's replacement.
joel_herrera, Yes, this is a very common symptom of a failing Switch-Mode-Power-Supply and/or Inverter circuit! Very common in 2-4 year old lcd/fpd's. How old is your's? Do you have warranty? Have you tried the Flashlight test? DO THIS! Reconnect lcd monitor to your fully booted PC with a known good WIN desktop screen. Then power "on" the HD2201 and tell me what happens and what you see or don't see after the screen goes BLACK! Shine a bright flashlight onto the screen at different angles and let me know the results. I'm louie12fix on fixya or lmistyrel @aol.com BYE
Simplest solution may be the screen resolution settings are set higher than the monitor's capabilities. Try lowering the screen resolution and refresh rate in the display properties or try booting to safe mode (press F8 when the Windows splash screen first appears) and see if the LCD will display the windows desktop. It that works, check your video drivers and the screen resolution and refresh rate settings. If the monitor has the problem in safe mode and/or if lowering the screen resolution and refresh rate don't help then I suspect the a problem similar to one some Dell 17inch LCDs have. On the Dells It is usually caused by a defective voltage regulator transistor in the backlight inverter circuit. Troubleshooting that problem should only be attempted if you have experience at repairing electronic circuitry since it will involve testing individual components and soldering.
My name is Todd and I'm a customer advocate at Dell's corporate headquarters. My team helps customers via blogs, forums, and other tech sites online.
You said the monitor is 2 years old. Do you have the original order number still? Depending on how you purchased the monitor it may have up to a 3 year manufacturer warranty and I may be able to replace it if it is within that warranty period.
Please email me at Customer_Advocate@Dell.com if you can locate the order number and I'll be glad to see if its still under the manufacturer warranty. Include my first name (Todd) in the subject line of the email so it can quickly be routed through to me, and include the order or customer number if you have it.