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Old 05-21-2013, 03:18 PM
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DetroitT DetroitT is offline
Join Date: Dec 2000
Location: Detroit, Mi, USA
Posts: 2,254
Default Re: Impossible to start Pro Tools on MacPro after downgrade Mountain Lion back to LIO

Boot in Lion recover, Verify disk (Repair if errors) then Repair permissions.
Clean uninstall of Pro Tools.
If not at 10.7.5 use combo updater to get there.
Install PT's HD 10.3.5
Pro Tools will Likely will crash on first try (Registration).
Install latest iLok drivers.
Log out / in
Launch Pro Tools again holding the "n" key which will open playback engine.
Adjust CPU's less 1, Buffer start at 512, Disk cache....Choose HDX / HDN what ever you have.
Come back and let us know how you faired.

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