Man, we've had a rash of bad macs in the shop lately. We've got a MBP A1297 which the customer has simply requested the drive be wiped and the OS clean installed. This one tops out at High Sierra I believe. Anyhow, installing from USB, the installer progress lined will get to 100% and then the machine just hangs - all night it hangs. Tried to do it from internet recovery instead and when I choose continue on the installer, after about 2 minutes, I get an error that the recovery server could not be contacted. The machine is connected to the network so I don't know why. I've tried resetting NVram, as well as setting the date using 'sntp -sS time.apple.com' to no avail. I also tried setting the date to Sept 25 2017, the release date of High Sierra. What the heck is wrong with this?