Posted 25 July 2010 - 06:44 AM
If you don't feel you have the technical expertise to open up the monitor, then there's nothing further you could try except get it checked out by a repairer. As you've observed, the absence of the OSD indicates that the fault is in the monitor itself, rather than a strange video card fault sending a black image to the monitor. You can confirm further by removing the signal input from the monitor, and ensuring that you don't see whatever "no signal" display the monitor normally shows before going into standby. Another trick: if you hold a torchlight gently against the front of the screen when the computer is on and the room dim, you will usually be able to faintly see some of the expected desktop display lit up by the light spill coming back from inside the display.
If you can find a repairer who will offer a no-cost or low-cost quote, that offers a low-risk approach. But a no-cost quote might be iffy, because a business still has to make money somehow, so a no-cost quoter might have a higher overall cost on their repairs, to make up for the no-cost quotes they do but don't get the jobs...
Another possible approach is if you have a technically minded friend or relative, or if you know of a local electronics hobbyist or ham radio enthusiast, they might be able to check it out for you.
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