I've owned Apple computers since 1986. I loved Apple computer until I bought this complete garbage. Search function is slow or locks up. Search function can't find files even on the desk top.  The preview image system locks ups and can't open jpgs. The screen grows dark at night--at NIGHT, making it extremely difficult to see. And yes, I disabled that automatic function and it still grows dark.  Total RIP OFF. TOTAL PIECE OF GARBAGE.And good luck with Apple support. They talked me out of returning it and tried to "trouble shoot" the problems. Had me download system updates. Had me do this, then that... and then the return date expired. Now I am stuck with an expensive piece of junk.