Mac pro 4.1/5.1 won't load the boot screen!

[andyllewellyn]

Hey peeps, may mac pro won't load the boot screen after pressing cmd/alt when turning on, have the boot loader usb all done and plugged in and showing as such and also did the firmware update when pressing cmd+r but will not allow me the cmd/alt function.

I am trying to install a fresh copy of high sierra, i have every thing i need off the disc so just want to overwrite and start fresh as this is going to be sold!

Thanks

Andy
[doublepost=1550158260][/doublepost]It already has high sierra!

 

[CoastalOR]

may mac pro won't load the boot screen after pressing cmd/alt when turning on, have the boot loader usb all done and plugged in and showing as such and also did the firmware update when pressing cmd+r but will not allow me the cmd/alt function.

I am trying to install a fresh copy of high sierra, i have every thing i need off the disc so just want to overwrite and start fresh as this is going to be sold!
It already has high sierra!

I do not see the "cmd/alt" combination at turn on.
https://support.apple.com/en-us/HT201255

I think you want to get to the Startup Manager which would just be Option (alt) key at turn on.

 

[andyllewellyn]

You are correct, i always get confused as it says option/alt which is the same thing where as I think it was cmd/alt!

Thanks!