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Re: cutting on and off
Apparently this is a fairly widespread problem in 2005 and 2006 and is caused by a backlight failure; usually bad solder joints on the backlight inverter board. HP originally extended their warranty to 20+ months but it apparently has expired since the HP pages have all been removed.
This is likely to be an easy repair and relatively inexpensive job by a qualified service technician and is NOT a job for the typical user due to exposure to high voltage.
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You say your monitor is now humming. I understand this model has integrated speakers. Have you tried turning the volume on these right down, or even disconnecting the computer from these speakers as they may be picking up a "mains hum" from somewhere.
Hope this is helpful, if so would you please register that with Fixya
I was having this same problem with my monitor for days and it was driving me nuts, and being in IT not being able to solve it was even worse. My Viewsonic is a VA2232wm with built in speakers, I muted the speakers on the computer and using the control buttons on the monitor with no luck, it was still clicking. I move my laptop to and from my desk all the time and everything goes to the monitor via a USB docking station except for the audio. The audio cable I have to plug in separately. In my haste, the last time I connected the audio cable to my laptop, I put it in the microphone jack instead of the speaker jack. Once I moved it to the right jack, the problem was solved. Not sure if this will resolve your problem or not, but I hope it helps.
Buy yourself some stand alone speakers, a base & two side speakers, they cheap these days, base speaker has buit in amplifier & plugs into mains, or get surround sound 5speakers & a base, again mains powered, loud enough to annoy neighbours on full. Built in monitor speakers are renowned feeble tinny sounds. Right click speaker icon, bottom right, on your desktop toolbar, open volume control, ensure volume sliders set to max.
There are no speakers attached but if for any reason humming is comming its the transformer inside the casing. Very comming in transformers that after some time they start humming noise.Its not for all of them but its some coiling fault but it doesn't effect anything.
I have had the same problem. Only differance is that I run a freeview box though my 940 mw. I thought it was that playing up. Also I all the keys are locked on the unit itself. The remote works everything but when I press any buttons on the monitor you get a 'keys locked info' up on screen. Its doing my head in!!!