Windows 10 - screen won't turn off after specified time. The screen is blank. The backlit keys are lit. Also the computer wont turn off by holding the power button, I have to use the power cut off switch from the PSU. 2017-01-15, 14:11 PM ... it switched off on its own, tried to turn it back on and the display doesn't come on and none of the hardware will turn on either. and I tend to disable them. For such a relatively small device, a lot can go wrong with your laptop or computer.One of the more frustrating things that could go wrong is when your screen won't turn on.You may find that your fan is working, but there is nothing on your display, or there is just no signal. The fan is on the loud side. Try disconnecting all your peripherals to see if that’s the core problem. When Harrison Bywater turns on his PC, the power lights and the fan turn on, but no image appears on the screen. Monitor turns off and will not turn back on. I'm not a big fan of hibernation, sleeping etc. It turns off and after 3-4 seconds boots normally back again. I currently have my computer set to turn off the display after 1 minute and go to sleep after 5 minutes. At such times, all other internal components will be operating but not the whole computer. I set this machine up and I'm a big believer in the power button turns the machine on and off. Computer turns on but the display doesn't? What i noticed odd about it is when i first set it to an amount of time to turn the monitors off at it works. Here is how to do it: 1) Press and hold the power button until your computer turns off. Sometimes, certain peripherals connected to your computer may also cause the black screen issue. 2) Disconnect all peripherals (your … Latptop won't turn screen on after waking from sleep in Windows 10. The only thing that will come on is the light coming from the power button and the computers built-in fan. I have everything latest, updated, no viruses, turned off fast startup. The power button is lit. I'll start with the bad news: … Follow the steps below if your computer won't turn on after power surge. Sometimes, when you say "my computer won't turn on," chances are high that your device might be getting the power, but it still won't turn on. I am using an asus x99 deluxe, sli 980ti, 1 acer xb280hk(4k) and 2 qnix 2710(1440p). I recently upgraded to Windows 10 and since I upgraded my computer won't turn off the display or enter sleep mode automatically. Machine won't sleep when you close the lid. When I turn my computer on now the fans and light turn on but my display doesn't get any signal. It stay in sleep mode, if it goes to sleep by timer. Screen occasionally goes black, can't turn it back on without a system restart. When i come back to the computer and move the mouse it turns back on fine, but that amount of time selected will not work again. Computer Has Power But Won't Turn On. 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