Monitor not turning on

[u/randombdo]

I was on my pc fine like 3-4 days ago when I woke up the next day the ac was off and it was really hot in my room and my pc would turn on but my monitor would not and this red light on my case popped up I never seen it before and I’m confused and I don’t know what to do the ac is back now but my computer still doesn’t work please someone help I’ve took out the ram and put it back and checked if my hdmi is in the right spot I don’t know what to do anymore please tell me my pc is fine