Mac Pro (Mid 2010) General Troubleshooting — Memory Diagnostic LEDs 25
2010-08-31
Troubleshooting Memory LEDs
Follow this procedure when troubleshooting each DIMM identied by a red LED:
1. Remove and reseat DIMM.
2. Restart computer. If associated LED is no longer illuminated, issue is resolved.
3. If associated LED remains illuminated, replace DIMM with new DIMM.
4. Restart computer and verify LED is no longer illuminated.
There is one exception. If two LEDs illuminate at the same time for the 3 DIMM and 4 DIMM
slots or for the 7 DIMM and 8 DIMM slots, check both DIMMs using this process:
Check Result Action
1. Remove both DIMMs identied by
illuminated LEDs. Set DIMM 4 (or
DIMM 8) aside, and reseat DIMM 3 (or
DIMM 7). Restart computer. Is DIMM 3
(or DIMM 7) LED illuminated?
Yes Replace DIMM 3 (or DIMM 7) with
new DIMM. Go to step 2.
No Go to step 2.
2. Reinstall DIMM 4 (or DIMM 8). Restart
computer. Is one or both LEDs
illuminated?
Yes Replace DIMM 4 (or DIMM 8) with
new DIMM.
No Issue resolved.
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