I'm having two rather bothersome issues with my Mac Pro that I've been unable to resolve. The first is that the machine hangs on shutdown - and often on startup as well. On shutdown it hangs on the wallpaper screens - no cursor, no dock or toolbar. I have to force a shutdown with the power button on the tower. On startup, it will occasionally hang on blank grey screens - no Apple logo or loading bar shows up. Starting up in Recovery Mode allows the computer to boot fully. The second issue is that I'm unable to trash a particular folder. I'm getting error code -8072 when I try to drop it in the Trash. Disabling csrutility in Terminal did not work, sudo rm -rf/filepath did not work. Machine is a Mac Pro 5,1 (Mid 2010). 2x 3.46GHz Intel Xeon chips, 64GB 1333MHz DDR3 ECC RAM. Radeon HD7950 GPU. Two SSDs on PCI cards, one of them runs the OS. Two HDDs in the drive bays.