dude we need so much more info xD
1. what GPU?
2. what Driver Version?
3. what Windows?
maybe:
4. did you upgrade your GPU?
4b. did you had a Nvidia GPU before?
here do this:
1. run latest version of DDU (DisplayDriverUninstaller) in Safe-Mode as Admin
2. choose clean Driver + restart
3. after restart install LATEST driver fitting your GPU (so eiter 19.1.1 or Legacy)
4. RESTART AGAIN
5. test if its working now
PC: R7 2700X @PBO + RX 580 4G (1500MHz/2000MHz CL16) + 32G DDR4-3200CL14 + 144hz 1ms FS P + 75hz 1ms FS
Laptop: R5 2500U @30W + RX 560X (1400MHz/1500MHz) + 16G DDR4-2400CL16 + 120Hz 3ms FS