13135 Views 3 Replies Latest reply: Jan 29, 2009 9:26 AM by snatchmo
Hi snatchmo: Your description of the issue sounds suspiciously like an issue with incorrect RAM. There have been quite a few posts on here that are like yours. Work fine with one original stick of RAM and one new one, but will not boot with 2 new sticks. The common thread seems to be RAM that is rated at 800mHz. Is your RAM rated to work at 800mHz, as well as 667mHz? If you have a model/part number on the RAM we may be able check it's specs.
Hope this helps
Response from Centon suggests this: "MacBook Pro EFI Firmware Update 1.6 "
I don't think it applies.
Model Name: MacBook Pro
Model Identifier: MacBookPro4,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.5 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 6 MB
Memory: 3 GB
Bus Speed: 800 MHz
Boot ROM Version: MBP41.00C1.B00
SMC Version: 1.28f1
Still at a loss as to why both modules won't work together. Centon advises that system should boot with only one module installed, I'll give it a try.