Gabriel Androczky

Hi Ron, I don’t know what that exact error is, but I would assume that the online file it refers to is not available anymore, this might be the cause. A self-contained installer would possibly be the solution here. I have long ago sold my 1,1 and am riding a 5,1 since, so I lost track of these things, but I would say that this might be the cause. Can anyone else confirm? Cheers, Gabriel

I guess it’s also important for the updater that only the original gpu should be present (GT120 if I remember well) and no other cards. Try flashing with the updater a couple of times. What did you have in the machine when flashing? Hope this helps.

The battery was going to be my next bet. For me, the exact same behaviour was a firmware issue as I had a Mac Pro 1,1 CTO and the firmware revision I had was somewhat special (higher version as the last released HW revision). I did a firmware upgrade to the Mac Pro 2,1 firmware and that solved the issue altogether. However, before doing that and getting rid of this problem, I changed the battery and it turned out that changing the battery momentarily solved the issue for 1-2 restarts, then the problem came back. I swapped cards, removed cards, tried out all kinds of things.... the FW upgrade solved it. Actually downgrading the firmware a step would have also solved it probably, but it was not possible. Update (05/07/2017): How are you unable to zap the PRAM? Power on, then immediately hold the alt-command-p-r keys... Oh, a thought. Plug your keyboard directly into the machine, don't go through a hub or a usb card!

I got rid of the problem. My Mac Pro is restarting correctly 100% of the time now. Please, Sue, if you're reading. Confirm using System Profiler, that you have ROM version MP11.005D.B00 If so, I assume you have a CTO (customized-to-order) Mac Pro 1,1. Let me know.

Actually the clicking noise the poster refers to (as I have the exact same problem) is the optical drive resetting... and since that power cycle goes in a loop, you hear that again and again and again along with the fans blowing and calming down, then blowing again, then calming down again... typical restart stuck at some point then starts over....