You should have given us the Model, but see if this helps... http://forumserver.twoplustwo.com/48/computer-technical-help/where-power-button-samsung-syncmaster-t220hd-monitor-321111/
SOURCE: samsung syncmaster 753df power button no longer works
check in back side of monitor reattch power cable after clean dust from it.
also check with other power cable that your monitor turn on with other cable.
SOURCE: MY SAMSUNG SYNCMASTER MONITOR SCREEN DOES NOT COME
The cable connecting to the PC might be loose, or the part entering the monitor could be.
Try turning the monitor on, and after a few seconds, turn on the computer. You should be able to see the BIOS POST screen text flashing by. If you can't, there is something wrong in your hardware settings.
If you can, however, that's the OS resolution set too high: the monitor shuts down to protect itself. Boot in safe mode by pressing the F8 key immediately after powering up, then lower the video resolution in Control Panel display settings to something safe - 1024 x 768 usually does the trick. At that point you can reboot in normal mode and raise the resolution again to the maximum supported by the monitor (check the manual for that).
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