You go back to the condition when it worked.

Laptops only have a few parts and it really upsets the new tech when they encounter a failing laptop and it's the motherboard. That's the expensive part unless it's some mass produced model we can get on ebay or groupon. I'll continue along here that MAKE AND MODEL matters in such discussions as those old core 2 models are showing up a lot on the usual outlets cheaper than any repair would be.