This doesn't seem to be something you can do yourself or suited for remote diagnostics on a forum. Better find a trusted repair shop and let them have a look. It might be free if you buy your new laptop with them.

In the mean time, find a free or nearly free PC at second hand sites, freecycle and such. Laptops are somewhat more expensive than desktops, but have the advantage you don't need a mouse, a keyboard and a monitor (which usually aren't free, if you don't have a spare one).