All in a sudden, my AMD HR 7750 had this problem today. I turned on my PC today and realised that my monitor display "No visual detected, entering sleep mode". But I saw my mouse and keyboard were working properly. Because of curiosity, I connected my VGA cable to the Port that is on my motherboard and the display was working properly.
I opened device manager and saw that error code on my graphic card.
I opened device manager and saw that error code on my graphic card.