"Early 2008 MacBook Pro Mac OS X Install disks showing prohibited symbol: I wiped the hdd and wanted to do a fresh install and it won’t boot my macOS X 10.5.2 install disk for that MacBook Pro, I attempted to use a macOS X 10.5.7 usb I had laying around but it said that I can’t install macOS it doesn’t even show the installer note: I have both disks but I’m only showing one, the first one says MacBook Pro."
-------
Troubleshooting macOS Leopard Install:
A. Provide a Photo:
Are you saying you cannot format the Mac? Are you in Disk Manager, while booted in Recovery Mode? Reply back with a photo of what you are seeing on your display. IMPORTANT: Block out any personal info, whatsoever (i.e. names and time), by covering it with red-colored rectangles through use of the Photos app.
B. Decrypting the Drive:
If this is Encrypted, then you'll need the password to format it.
C. Use First Aid:
While trying to format, select the drive, and then click the "First Aid" button on the top of the Disk Utility window.