Red Ring of death no start

So I was wondering if anyone knew the fix for the Red Ring of death. I don’t personally own the console as it belongs to my friend and have Only been told of this issue. But I appreciate any hints I can Get before I go in looking so when I get my hands on it I’ll have a better idea of what to look for.

Issues stated:
Red Ring
Does not start
No image

That’s apu mate rlod and ylod are apu red ring of death is xbox not PlayStation I own both and have had to deal with them