resetting nvram pram on mac

Try starting while holding the Command-Option-Shift-Delete keys all at the same time and see if it will let you startup/install.

Do you have any external drives you could install Tiger on first?

If the above doesn’t work, try this:

1. Start Mac and hold Option-Command-O-F keys
2. When the grey screen gets loaded type reset-nvram then press Return key
3. At next prompt type reset-all and the Mac will restart

See if that will allow install.

Categorised as: Hardware/Software, Linux/OSX

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