My iMac's hard drive was dying and it was no longer under warranty. I took it to Mac Mechanic and he not only upgraded my OS but put in a 1TB drive (the dying one was only 250GB), cleaned the inside, and transferred my back up drive. Everything was as good as new and only took 3 days to complete. Plus all that for a reasonable price. I'm definitely going back in the off chance my computer has issues. Talking to him in person you ca...