Motherboards don't often "suddenly die", or have slots "go bad" for no reason. My experience here, is that the capacitors fail. And if replaced, the motherboard is good for a full second life.

So.. open up your computer case, and take a good hard look at the tiny little (typically ~1/4 inch round) cylindrical devices on the motherboard, particularly those nearest the massive CPU heat sink / fan area.

They should be clean, without leakage, and have nice, FLAT, tops. Any bulging or even cracking on the tops, or fluid/gel leakage out the bottom, means they have failed.

Any good TV/electronics _repair_ shop can replace them with new ones for you. I have done similar replacment repairs to perhaps a dozen motherboards here, all of which were 100% functional again afterwards.

Cheers