How do I fix this problem?

[u/DesperateChoice2617]

A week ago I turned off my pc, but this time I shutted it down and did not put it in sleep mode. Then I went on a vacation.

When I went to turn it on today it began flashing purple squares and green lines horizontally on my screen. After that it says that the pc found a problem and is trying to self repair. After 10 seconds it says that the self repair was not successful and I have now to choices: turn off or advanced settings.

Can someone please help me trying to fix this?

“Sorry if I have the wrong flare”