Shut down your laptop and try pressing the center of the keybord just center of your screen firmly gently and then start the system if its ok the display comes back you are having problem with the heat sensor of the display card and not coooling properly .so loosing the display.
BUT if you mean there is a cursor blinking on the screen and dosent have display then your boot devices are configured improperly and so its searching for boot device .
also it happens when usb boot is enable in the bios and any usb device is connnected like flash or usb hard drive try to remove them and restart the pc.
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