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If it doesn't turn off by holding the power button down for 10 seconds, then it cannot be turned off by the power button alone, like most modern lcd monitors. Most modern monitors goes into standby mode. To completely cut power, you must unplug the power cable.
I've enclosed a link to the install manual for reference. Samsung SyncMaster P2050 User Manual Page 7
i will give you some tips
1- If the power light goes from green to orange) this is almost always an issue with the computer and not the monitor
2- If the monitor power light turns off, then it is almost definitely a problem with the monitor.
there are some reasons your monitor turning on and off
01-One reason the monitor could shut off is because it is overheating.
02-If the power cord is loose and is not securely connected to the back of the monitor it will cause the monitor to turn off.
03-If the monitor is staying on, but you loose the video signal, it's very likely an issue with the video card or motherboard in the computer. This could also be an issue with the computer or video card overheating or a defect with the video card.
04-Another reason the monitor could shut off is because of a malfunction in the circuitry. There could be a short in the wiring or some other failure in the circuitry, causing the picture to go black or causing the monitor to shut off completely
05 another reason the monitor on and off is because your monitor power supply chipset is damage
Try to unplug the monitor and totally shut down your PC. Wait 10 seconds and plug your monitor back in. Make sure the power is off on your monitor. Turn your PC on then turn your monitor on.
If you still don't get a picture and the light keeps flashing the monitor will need to go in for service. If it's no longer in warranty its best to just purchase a new monitor (will cost almost as much as a new one to fix)
This could be one of two problems, the light in your monitor has a loose cable, or the light is dying. I have seen cold cathode lights that are about 10-15$ to buy and many instructions on putting them in yourself.
Solution 2, your cable is loose on the back of the monitor. Make sure you have the screws tightened on either side of the vga or dvi cable, both on the back of your monitor and on the back of your computer or laptop.
Sounds like the power button on your monitor is not on, is the light on the monitor yellow and dim or bright when you start the computer? Make sure the monitor is on. If you hold the power switch in for about 10 seconds the power will turn off. But that is not the recommended way to shut your computer down. Use your start button and log off or close that way. Good Luck.
well by ordering the caps replaced that is a start for the first one it should work like new when you get those replaced, second monitor it could still be a cap issue but you need to look and see if they are doomed if hey are popped then they need to be replaced, one of the reasons they shut down is variance in the power supplied to the ccfl if it variances too much the unit shuts the vga and thereby the ccfl unit off. fyi you don't need all the caps replaced just the popped ones.