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1. Verify the monitor's power cord is plugged firmly into the wall outlet and the back of the monitor.
2. Verify the monitor cable is firmly connected to the computer and the monitor.
3. Verify that you have turned the monitor power switch on.
4. If the power light on the monitor is not on, test the wall outlet (plug in a light or something you know works).
5. If the power light on the monitor is not on, try a different power cord.
6. If the power light is on and yellow or flashing, but nothing displays, borrow a monitor from a friend. If that works, your monitor needs replaced.
This generally is not good news, when the power comes back on it peaks causing the damage in it's wake. The power supply has been compromised and if you are very lucky you might get away with a fuse change. The monitor will need to be dis-assembled to assess the situation and hopefully it will start back up with minimal repairs. The fuse should be located near the power cord going into the circuit board.
Check the power cord, make sure it is firmly connected to the mains outlet and in the monitor. The power cord maybe faulty. try a different power cord,
If this doesn't work then the fault is in the monitor, most likely the power supply circuit.
I don't know this make and model, but it may have a blown fuse. If you are not an electronic savy person, I would advise you NOT to try to fix this problem, as there dangerous voltages in the monitor.
The cost of a repair maybe too high, I suggest you put your money towards a new LCD monitor.
Could be the power supply like you said and the most obvious things to check when its open is the small fuse on the power supply or any capacitors which are buldging which are faulty.
This is for lcd monitors which have a built in power supply or if you dont know they use the kettle type lead =].
The clipping sound is the internal safety switch that keep shutting down the monitor. It means there is an internal problem on the main board (overvoltage, bad component , short). Try unplugging power cord and leaving it unplugged two or three hours, this will reset ICs by draining power completely from circuits, it is called hard reset, it rarely works. CRT monitors waste up to 15 times more energy than TFT screen, if your CRT starts giving troubles, then it is a good time for upgrading it to a new TFT. 17'' start at $120
If you can open the cover of your monitor try to locate the fuse maybe the fuse is busted replace it. if the fuse is blown or busted again there is short circuit in your power supply maybe the diode or the power transistor is shorted you need this to bring to the shop for services