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Your computer may not be seeing your second monitor. Go to your display settings and see if you computer is seeing monitor 2.
A fast way to check is to plug this monitor in as your primary on the computer to see if it works.
It can be the problem in the backlight inverter board or the power supply problem. You need to open it up and start looking for bad caps with bulging top first. Post back what you see inside. See example of failed monitors due to bad caps: http://s807.photobucket.com/home/budm/allalbums
If the monitor has no power at all then you have a dead power board, or
a broken power cord, test also a different wall AC outlet.
If instead there is a flashing led on front of the monitor, that indicates a fault condition.
The flashing light indicates a diagnostic state called protection.
When the Monitor goes on protection there are only two possible causes.
1
The internal circuits are jammed because of electrostatic charges
accumulating on capacitors, or because of a wrong voltage read by the
main chip on your monitor controller board. this started the protection
circuit.
2 The protection circuit detected a wrong voltage or a
broken contact, identified an internal fault and kicked in , starting
the flashing light.
If you are in situation one, then the
monitor will reset just unplugging power cord for one or two hours,
sometimes even minutes.
If you are in situation 2 , then there is an internal fault.
Common
faults that can occurr suddenly are a blown capacitor on power board,
the inverter board powering up backlight lamp has blown, or a fault on
main lcd controller board.
check also the video cable, if the cable
is shorting, or the connector is bad, you can get same flashing state
because of the video cable.
Check connectors, try moving the video cable, and if the cable is not built in, then also try a replacement cable.
Regards
if you have a flashlight.... shine it into the back of the monitor thru the vent holes.... do you see a anything displayed on the screen ... while the computer is on of course.
I fixed mine. Had to replace one bulging capacitor in the power supply. Yours may need more or less but it was pretty easy if you do any electronics. The specifics can be found under some of the other problem posts, especially for one of the 19" sceptres.
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