STOP!!! You dont’ have to buy a new computer!!! If your computer used to work but is starting to become a slug. Try Linux. I find it works better on all my older computers (10 years old).
Think about how you use your computers. The majority of people don’t need a Mac book or a $1000 computer. With the right OS, you can keep that out computer working just fine (Ubuntu, Mint).
Sorry about the static noise. Still trying to sort that out.