Apple Power Mac G5 Uniprocessor Firmware Update 5.1.5f2 is Available

for download via the Software Update preference pane or as a stand alone updater. This update comes hot on the heals of the one issued last week that caused problems with some single 1.6 GHz Power Mac G5s. According to this Apple KBase document,

Some 1.6 GHz Power Mac G5 computers don't work properly with Uniprocessor Firmware Update 5.1.5f1. However, Firmware Update 5.1.5f2 fixes these issues.

Here are the issues you might see on a 1.6 GHz Power Mac G5:

• A kernel panic.
  
• A USB input device, such as a mouse or keyboard, becomes unresponsive.
  
• Bluetooth USB modules don't respond five minutes after starting up.
  
• Interruptions in iTunes audio playback.
  
• Disconnecting and reconnecting affected devices does not help.
  
• If you have any non-Apple memory (RAM), removing it usually stops the issue.

The issues revolve around some third party RAM. Apple instructs one to remove such RAM before installing the firmware update and to re-install it after updating.