Gpu not displaying

Alright so today in the morning at around 04:00
I turned off my pc, and at like 17:00 when I wanted to play again my gpu WOULDNT display. I tried to test if it was the hdmi cable and that’s not the problem, I unplugged my gpu took it out and put it back in and it didn’t change anything. Then I took out the ram still nothing changed. The pc still turns on the keyboard lights up the mouse too but it just doesn’t display. Can anybody help me pls? My specs are :GTX 660 + i5-4590 + ASUS H81M-K motherboard.