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Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums Post back what you see inside so we can guide you further and it will help out other people in the future also. http://en.wikipedia.org/wiki/Capacitor_plague http://www.badcaps.net
Stefieanne, The long, thin, "cold-cathode-fluorescent-lamps" are not staying lit anymore. Unit's "switch-mode-power-supply/CCFL inverter supply will need REFURBISHMENT to restore proper operation. SOFTWARE WON"T HELP YOU!!!!! Visit all links you find while doing some reading in my fixya profile to help you in the big decision you will need to make on what you will do with this "black" or "blank n black" screen ccfl back-lit lcd monitor. Do you have soldering pencil of about 35 watts and some solder and pliers and screwdrivers and even a digital voltmeter. Contract out the work $35 to $90 Tell us what your intentions are. 12fixlouie
First make sure that your VGA cable comming from the back of your monitor is still connected to your computer, check both sides on the back of your copmputer and your monitor if they are both in then maybe your cable is bad.
Unfortunatley your monitor is going out. I just had that problem. My sceen would come on, but after about 10min. it would blink off and turn black. I would have to hit the off button on the monitor, then turn it back on. It would work fine for a few minutes then black out again. I got a new/used monitor where I no longer have that problem.
I did check to make sure my hybernate was not activated, it wasn't, I had it set to never turn off.
The high pitch sound is coming from the inverter. It is faulty and needs to be repaired or replaced. The inverter supplies high voltage to the CCFL lamp, this lamp gives the backlight to the LCD so you can see the LCD images.
Check out LCD parts for parts, service and DIY info. use this link :- www.lcdparts.net
If you have soldering iron and can place an order at DigiKey.com (and are willing to get your hands down on this), this is a rather easy fix with some direction. You basically will be replacing some failing capacitors inside the unit.
Either the power supply is going bad (power light will be orange or off when it goes dark) or the screen itself has the problem (inverter?). If the power button stays green but the screen goes dark, that'll be the problem.