You could have a serious problem there... You'll have to do some digging at tivocommunity.com to see if there is a serial port solution for the MAC; or get yourself a PC serial cable from 9thTee.COM and see if you can adapt it for your MAC (and/or borrow a PC or laptop, which might make it easier).
In any case, once you have a serial connection, you should be able to edit your rc.sysinit.author file, but if these activities are foreign to you, you might be better off ordering a 'recertification' from our support page and having us reinstall the software for you.
For answers to commonly asked questions, please refer to the
InstantCake Instructions and Release Notes,
Official InstantCake Discussion Thread, and the
Official PTVnet Discussion Thread
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