Welcome to Justanswer.com, my name is ***** ***** I will do my best to assist you.
Before I suggest any repairs, I need to know the version of mac osx you have installed, you can check as follows. Click the apple sign at the top left of your screen, then click about this mac. And then where it says version, send that to me as a reply.
Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.