I’m not sure that should have resulted in such serious problems. The SSD shouldn’t be getting that hot from just sitting in the BIOS??
Have you talked to support yet?
It sounds like you’ve tried everythhing you sensibly can.
Unless you forgot to turn the power socket on or your power supply is duff, I don’t think there’s much you can do.
There is another power button on the mainboard under the Mid plate in case it’s the power button that’s the problem, to the left of the wifi card.
Don’t touch anything else in there while connected to the AC power or it could blow something.