Apple Mac Pro - Page 48

Mac Pro (Mid 2010) Symptom Charts — Memory Issues/Kernel Panic and Freezes 48
2010-08-31
Memory Issues/Kernel Panic and Freezes
Unlikely cause: Power supply, fans, enclosure
Quick Check
Symptoms Quick Check
Memory Issues/Kernel Panic and
Freezes
• Computer has kernel panic
or freezes on startup, when
waking from sleep, or during
normal operation
• Memory not recognized in
System Proler
• Fans run fast
1. Reseat all DIMMs. Refer to Memory Diagnostic
LEDs.
2. Reset SMC
3. After power ON, verify front panel power/sleep
LED illuminated, and not ashing any error
sequences indicating a memory failure.
4. Remove the installed RAID card and drives during
troubleshooting. Install a known-good SATA drive
in bay #1 with compatible Mac OS X installed.
5. Verify the video card is supported in this
computer. Previous model Mac Pro video cards
may not be compatible. Cross reference the EEE
Code and GSX part number.
6. Verify with known good and compatible ECC
DIMMs. Installing a non-ECC DIMM will cause all
memory to run as non-ECC. Note that memory
from older computers is not compatible and
cannot be used. See Memory Conguration.
7. Ensure the compatible memory is lled in the
correct order in the memory slots. If memory
is not congured for the best performance,
the “Memory Slot Utility” will appear onscreen
and recommend an improved conguration.
To use the utility again go to /System/Library/
CoreServices/Memory Slot Utility
8. Conrm total memory in System Proler.
9. Startup with ‘Shift’ key down for safe mode boot.
Check DiagnosticsReport folder for crash cause.
10. Startup from original install media, or known
good boot device with compatible OS X.
11. Run AHT or ASD.