![]() ![]() ![]() You can even try selecting the boot disk on that computer and restarting to see if there's an actual file-level issue with the your operating system. You can then try running disk integrity checks on it using Disk Utility as normal. My first course of action, however, would be to get a FireWire cable and boot to FireWire Target Disk Mode by holding "T" during bootup on the stunted computer and hook it up to a working Mac. I don't know so much about it to veritably say that this is causing your issue, but it's worth a shot. You could try resetting the System Management Controller. This should bring up a boot menu regardless of your holding the Option key. I'm not sure how likely it is that drivers tampered with the EFI.
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