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I would unplug everything from the back of the system, clean the connections with a brush and rubbing alcohol, then plug everything back in. Turn it on and see if you get the same problem. If so then try unplugging the cameras and see if the noise stops. If the noise stops then one at a time I would plug the cameras in watching to see if you get a picture and/or sound. You may have a bad camera that is sending a short to the system that sends the system in to a protection mode.
It may have dying power supply due to bad DC filter caps in this 4 years old momitor. If you are going to DIY and already try the monitor with another PC, and have proper tools and know safety precaution then please read on: Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, 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/albums/yy352/budm/ Post back what you see inside so we can guide you further and it will help out other people in the future also.
selectbanker, As a test only try this. Remove green plug from rear of pc. Find old am/fm stereo transistor radio or even a portable cd player and connect the green plug to your "new" audio source. Can you hear anything coming out of the monitor's speakers? Also try a set of stereo headphones in the green audio "out" jack to see if sound is coming out of the pc. Narrow down where loss of signal occurs first. 12fixlouie
how is ur sound output from the computer box is conencted....is there an external speaker thru which u listen sound ?
if so that cable from the sound output slot on the PC need to shift to the monitor speakers thru some cable that goes into the monitor from the CPU box....
Ok, to discard a computer problem, try to use a regular headphone such as the ones for mp3 players.Connect it to the microphone port in your computer and test it. It should provide sound recording. If it works fine, then probably the microphone just failed and you are going to have with an external one instead. Good luck
Check and make sure connection both in the back of the PC and the back of the monitor are securely in place and in the correct ports (holes). The ports are typically color coded a light green. Go into Control Panel (in Windows) and to Sound. Under Playback, make sure your speakers are listed and they are set to default (a little green check mark).
If everything looks fine, I would reinstall the software that came with your monitor and it will help you setup the speakers during the process.
I had the same problem. In frustration after trying everything else as I couldn't shut the monitor off, I shut the computer down, unplugged the power to all, and left it until this morning (12 hours). Now it works, so it must reset itself. I am waiting for feedback from their support as well but imagine they will tell me the same, good luck.
It sounds like a problem with your computer not the monitor. If you have a spare monitor you should try plugging it into the computer to see if the problem still happens to be sure it isn't your monitor. If it still happens you might want to check to be sure your video card isn't over heating. New computers can have problems from the start but that is why companies offer warranties. Call Gateway support and have them walk you through some troubleshooting.