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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
The reason why your monitor might not be recognizing a signal is because the graphics card in your pc might not be correctly plugged into a pci slot or your internal graphics may have a short somewhere. If the monitor turns completely off after it cycles Then it might be an internal problem with the backlighting in your monitor screen
This is a failure of the power supply in the monitor. It can be easily fixed by replacing a pair of failed 680 microfarad 16 volt capacitors. If you have a friend who is handy with a soldering iron they will be readily apparent as failed since the top will "bulge". I just put this monitor back together and didn't write down the designators, unfortunately. This is the second monitor I have repaired with this failure...apparently the value is not terribly critical, just don't use caps with a lower voltage rating. I actually just replaced them with a pair of 100 microfarad 50 volt caps since it was what I happened to have on hand and the monitor worked fine once repairs were complete.
It seems it is a motherboard battery problem. It most likely is not the monitor which is in "sleep mode", it is the computer itself.
When you cannot get a computer out of "sleep mode" by any other means, typically the cause is that the button-cell-type battery of your computer, which is located on the motherboard, is empty. When your computer detects this battery is empty, it goes into a low-power mode. The solution is to replace the button-cell battery on the motherboard of your computer
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i would advice you to take your monitor to a technician, but if you are not ready, please leave the monitor on and make sure it is connected to ups u can now turn it on and off from the ups, if you continue the menu, Auto fit etc stuff, you might damage or disorganize the settings of your monitor which might cost you more. thanks
One reason that this is happening could be that it is on Power saving mode. This happens when the LCD monitor detecs an incorrect timing then thats the time that the LCD goes blank and the power botton starts to blink.
what you need to do is to turn the computer off. Unplug cables attach to the LCD make sure it is also off, once done press the power botton for a couple of 30secs to a minute and then release. After doing so re-connect all the cables and make sure that both ends is tight and secure once everything is ok turn the computer on same with the monitor to check if it solves the problem.