First timer here on the discussion board. Is this thing working?
MacBook, Mac OS X (10.7.5)
Try reseating both cards and seeing if that changes anything.
If not check which card is being recognize in System Information. Then switch card in the slot and check System Information again. See if anything changes. If it changes odds are you have a bad card. If not, you have a bad slot.
Allan
Some older MacBooks support only up to 4GB of RAM.
Please check the technical specs of your model.
TZ
I've read in many reviews on amazon that it works on my model. thanks
Should I re-attach the bottom before each re-arrangement or can I do it with the bottom off?
OK I did one test with lower new ram and upper old (1g) ram and it reads 5g. I'll rearrange again to check the other new ram.
so I switched them around and it's still reading 5g. Both slots and cards are fine. I saw problems like this being discussed before buying this ram but I don't remember where. I recall some people saying they could only get 6g working.
Which model of MacBook do you have?
MC 516LLA
2.4 ghz processor 2g ram 250g HD
You are correct, it should support 8gB of PC-3 8500, 1065 mHz RAM.
Have you called Crucial support yet?
Allan
No. I was reading a previous Mac Comm. thread where person had same problem with MBP same year. No resolution there, either.
So far they have helped me whenever I need it. They might be worth a shot.
Allan
If you bought your RAM at a place that also sells PC RAM you may have gotten mislabelled RAM. PCs can handle different RAM speeds so they’ll often label higher speed RAM as a lower speed rather than make two different speeds of RAM. But Macs are much more picky. The way to tell is to put one of your old RAM sticks in and it will force the new RAM to run at the correct speed. Crucial makes some RAM that will only work in PC and not in Macs.
This is from one review of PNY RAM:
"These modules are actually 800Mhz. PNY no longer makes or sells 667Mhz modules. Not all computers that require 667Mhz are compatible with 2 800Mhz modules. They refuse to down clock properly. This is especially true with a number of Core 2 Duo MacBooks. Spoke to PNY support, they flat out told me that yes, they sell 800Mhz modules in 667Mhz packaging. If you RMA a module that is 667Mhz (or supposed to be 667Mhz) they will replace it with an 800Mhz module as they no longer have any 667Mhz SODIMMs, not even for RMA replacement!"
These are good online stores for Mac compatible RAM
OWC http://eshop.macsales.com/shop/memory/Apple_MacBook_MacBook_Pro/Upgrade/DDR3_Whi te - They offer Mac tested RAM at very good prices.
Crucial Memory http://www.crucial.com/ - good place to buy RAM from all over the world. They also have an excellent memory selector that allows you to choose memory based on your computer's model
Data Memory Systems http://www.datamemorysystems.com/apple-memory.asp - another good, cheap place to buying RAM if you live in the U.S.
A plausible answer! Thankyou. I bought these Crucial rams from amazon warehouse with reviews (200+) saying they worked fine on my MB and MBP's of same generation. I'll probably have to call Crucial as was suggested earlier. Thankyou everyone! ps if someone has had and resolved this problem please let me know.
I am trying to install crucial CT2CP51264BC 1067 PC3-8500 DDR3 2x4g ram. I've rebooted but computer only reads 4g. Is there something I can do to get it to recognize 8?
