View Full Version : G5 Logic Board Replacement Issues

09-01-2009, 09:23 AM
Replaced the logic board in a 2GHz, Two Processor, 8 mem. slot G5 Tower.
Boots fine. ASD tests all pass. Thermal Calibration was with one error but then successful. (Reported a MLB speed of 800Mhz and CPU speed of 2GHz. Told me to replace CPU with a slower one. Ignored and calibrated okay.)
Machine (and fans) seem to run normal. Temps are good. Problem: System Profiler only shows four memory slots! I can even put only one pair of RAM in the slots that don't show up and the machine runs fine. Profiler shows RAM slots as empty! I'm very puzzled.

09-01-2009, 01:27 PM
Only thing I can think of is to force a reset. Start up holding the Command+Option+O+F keys. At the '>' prompt type:

Hit Return
Hit Return
Hit Return and your G5 will restart. See if that helps.


09-01-2009, 03:21 PM
Thanks - Been there, done that... no go.

12-14-2009, 02:32 PM
Did you ever get anywhere with this problem. I just posted the same problem without having replaced the board.