User Guide
Mac Pro Troubleshooting — General Information 153
Blue system failure screens in Windows XP/Vista•
Not waking or sleeping when expected•
Bad media taking too long to eject (including holding mouse button down at startup taking •
minutes to eject)
Symptoms that may be resolved by updating SMC rmware:
Fan related behavior (excessive speed or noise)•
Loud audible clicking from some fans•
Thermal shut down or warnings•
Diagnostics reporting failures•
Sleep/wake issues•
Intermittent shut down•
SMC causes bad/missing ambient sensor to cause the computer to go to sleep•
Hangs, black screen on restart from Windows•
Quick power cycle causes Memory Riser Card Diagnostic LEDs & CPU Overtemp LEDs to •
illuminate solidly
Unit does not restart after changing conguration in Expansion Slot Utility•
Please follow the steps outlined in KnowledgeBase article 303364, “About Firmware Updates for
Intel-based Macs,” to perform an EFI and/or SMC rmware update. Information about rmware
versions for Intel Macs can be found in KnowledgeBase article 303880, “Mac OS X: Firmware
Updates for Intel-based Macs.”