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It could be a connection problem between your monitor and your PC.
On the back of the monitor, you will see a VGA cable (usually blue color), it looks something like this:
Make sure that this cable is connected properly to your monitor and the other end to your computer. NOTE: Those 2 round things are its screws, you have to turn them to remove the cable and turn them again from opposite direction to hold the cable in place.
A number of things can cause "No Signal" on a monitor
1) Check the cable between the monitor and PC is properly connected 2) If the PC has more than one display port try changing the display port the monitor is plugged into 3) Try an alternative cable between the monitor and the PC 4) Check that the correct input is selected on the monitor
Check that the Input signal cable is properly inserted in the VGA socket. Secondly the Primary VGA is properly giving display signals to the Monitor/LCD. Because there are cases in which VGA is the bottle neck of the trouble you are facing.
Cross check and update me with the status,
Best of Luck, Do RATE the solution, If found Helpful, Concerned.
I sure sounds like you have backlight problem, since when the VGA cable is connected the power LED turns GREEN and blinks when VGA cable is disconnected, it means the video signal is getting to the monitor OK, so more likely the problem will be in the monitor, but just to be sure, you should also try this monitor with another PC first. Most common failure 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 HP and other monitors to get some ideas what goes wrong: http://s807.photobucket.com/home/budm/allalbums Post back what you see inside so we can guide you further.
I would check the LCD against another monitor. It does not have to be a LCD, a regular monitor will do.
This will tell you 2 things, 1. The Video card is good or bad, 2. The Cable is sendinf a good signal.
If when you startup the monitor, you see a display and then after a few seconds it display's a no signal message, this is consistant with a Bad cable or cable ends. or Bad VGA card from computer.
Hope this helps. Good luck..
P.S. If you have move the PC, you may want to open the unit, and re-seat the Card. If the card is not making a solid connect on the board, it will display these syptoms.