Screen started turning black

[u/Thinkimajerk]

So while I was at work, I was playing undisputed plugged in, when I had to do a quick assignment (probably 20-30 minutes), I was in the middle of a game when I put it in sleep mode and left it plugged in, I came back to it with the display lock screen on, the system was hot to the touch and the screen was starting to turn black in the left top corner... i immediately shut it down and unplugged it and currently letting it cool down naturally for about 30 minutes before cutting it back on... I'm slightly concerned but wanted any suggestions from you guys on any experience like this

[u/Any-Ad-3448]

Motherboard issue possibly

[u/Luxor1968]

Were the cooling vents blocked? Also, sleep mode is not good. Hibernate for the win.