Hi Yanss1971, May i know, what's the power led light status? Red, Green, Orange, Blinking or Off? If you need more info on lcd monitor repair please visit this site as reference: http://fastrepairguide.com/p/lcd-monitor-repair/
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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
its unlikely to be the cable. Most likely cause of this is a faulty inverter board. If you are lucky it will only be 1 or 2 blown capacitors which are easily identifiable and replaceable once you have got inside it. it could however, be almost any of the components on the inverter board or even a failed backlight but this will require further testing and a knowledge of LCD monitor workings.
Your monitor should have come with two cables. One is for analog and the other is for digital and is rectangle. Before turning on the computer connect only the Digital cable to your monitor and the video card on the computer. Most monitors will automatically seance the Digital and operate when you start up the computer. Make sure the monitor is ON when the computer starts. Your manual should have instructions that will help. DO NOT CONNECT BOTH CABLES UP. Only the one needed. Hope this helps. Bud
1. Check the cable connection to your PC. It might be disconnected.
2. If your have more then one cable input on your LCD monitor(VGA or DVI) check if you selected correct input; digital for DVI or analog for VGA.