As to the overheating that's common for folk that don't get out the canned air every month or so.
Our similar aged DV7 was worth tweaking up with a new battery (25 bucks?) and a 500GB SSD (under80). But it has been kept fixed over the years. Keyboards are cheap from 20 to 99 bucks.
I do all my own work.
I have kept my Pavilion limping along for years. I just love it. Years ago, the keyboard stopped working, so I now use an external keyboard. The Wi-Fi drops for no reason, so I just have it hardwired. The battery no longer works, so I just keep it plugged in. I'm happy with this arrangement. Recently I couldn't open anything. I couldn't open any programs. I couldn't open any documents. I took it to the repair shop and they said that my system was overheating and the fix to that would be to clear out debris. I did not realize I could replace my motherboard until I was reading posts on here. Is this something I should do, or would it be pretty spendy? I don't want to get some piece of crap refurbished laptop that I don't like. However, that being said, what refurbished laptops are recommended. I can't afford much. I'm looking at 500 dollars. Is life over for me as I know it?