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Aktuelle Version von: Gabriel Androczky ,

Text:

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!

Status:

open

Ursprünglicher Beitrag von: Gabriel Androczky ,

Text:

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.

Status:

open