If you cant see no signal note you have to way to ensure that monitor dead. 1.you can borrow monitor and let it to work. if it dose not work too, that's mean problem from your PC that may be power supply or graphic adapter and finally main board.2.you can test your monitor with another PC. if monitor dead you should open it and search for short element or bulging capacitor.
Remove cable connecting monitor to computer, turn it on. If you see a "NO SIGNAL" note, your monitor is ok and the problem is the graphic card of your computer. If you've recently removed and reconnected the monitor, might be a bent pin of cable input.
If Monitor is dead when you turn it on disconnected, it's defective and you should repair it
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