I cannot turn off my Mac. Reset NVRAM, SMC, Reinstalled OS, still the same: I usually turn it off by pressing Command+Option+Control and the Eject Key. It get's stuck in a white screen with the cursor. I can move the cursor and the only way to get it out of there is by pressing the Force Quit key combo. When I do, spinning ball and goes back to login screen. The second time around may shut down. Would this be software or hardware related? Thanks.