Replaced HD and now it want run smoothly
I replaced the HD months back, but the computer hasn’t been working right since we took it to the apple store and they said it was the hard drive, so I put the old hard drive back in it, and it worked fine. Still needed to upgrade the hard drive I ordered one from you guys thinking it probably has a more proven track record, but it is still doing the same thing on the hard drive from you. What am I missing???