I have been tryng to install 2 2GB memory modules in my mid-2007 iMac and it will not boot with both memory modules installed. When I go to several memory suppliers they say that this model will only allow 3GB, but the Apple specs say 4GB.
Has anyone beena bel to upgrade to 4GB?
I have now gone through 2 upgrade kite trying to make 4GB work wihtout success. This is getting costly.
Thanks,
Jeff
iMac, OS X Mountain Lion (10.8.1)
A mid '07 iMac will actually accept 6gB of RAM. Are you using RAM as shown below?
| Maximum Memory | 6.0 GB (Actual) 4.0 GB (Apple) |
|---|---|
| Memory Slots | 2 - 200-pin PC2-5300 (667MHz) DDR2 SO-DIMM |
You need to purchase and install reliable Mac RAM from online Mac RAM vendors/sellers Crucial memory or OWC (macsales).
This is what Crucial states:
Your iMac 2.0GHz Intel Core 2 Duo (20-inch)System Specs
System specs as shipped by the manufacturer.
Scan your systemto view your specific system configuration.
Memory Type: DDR2 PC2-5300, DDR2 (non-ECC)
Maximum Memory: 3GB
Slots: 2
Maximum memory is reached by using one 2GB SODIMM and one 1GB SODIMM.The SSD is fully funtional in the system, but we do not offer a mounting solution at this time. An alternate mounting solution will need to be used.
Memory or DRAM is the "working" memory of the computer. It's used to store data for programs (sequences of instructions) on a temporary basis.
So, accordign to them them maximum memory is 3GB.
Jeff
Are you certain you have a Mid '07 model. Please post the Model Identifier number as shown below.
Hi Steadmen1,
Here are my specs:
Model Name: iMac
Model Identifier: iMac7,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2 GHz
Number of Processors: 1
Total Number of Cores: 2
L2 Cache: 4 MB
Memory: 3 GB
If there is a way to upgrade to 4GB (or 6GB) it would be great since I have been manipulating soem big files and more memory helps.
I may need to shop for a newer iMac.
Thanks,
Jeff
You can definitely upgrade the RAM memory to 6 GBs per stedman1 posts of RAM specs.
Purchase where I suggested.
Try OWC (macsales) for Mac RAM.
Very strange. As you can see from my iMac specs, mine is the same generation and mine is happily running 4gB. They didn't send you 800mHz RAM by chance?
Well, it did n't work. I got another 4GB kit from OWC and it did the same thing. Once both slots were upgraded to 2GB each the iMac would not boot. Perhaps it is the differnece between the 2.0 GHz Processor and the 2.4 GHz processor? Any other odeas?
Thanks,
Jeff
I have the 2.4 Ghz version and that takes 6GB and reacted fine. I checked MacTracker and that suggests 6GB for both 2Ghz and 2.4Ghz. Having said that I have seen several references to 4GB being loaded and only 3GB registering.
Just general info. Incidentally, it shouldn't cost you too much; most suppliers will accept back memory that doesn't work; Crucial, here in the UK does.
Same problem here...iMac 24 mid 2007.
It works with 3gb, but doesn\t start with 4gb. I have tried the very same ram units in my mbp and my mac mini and it works fine...Any idea?
have you tried taking the ram out and getting any dust that is one it of it?
or cleaning it? (obviously do NOT use water)
my imac mid 2007 works great with 4gb ram and i'm thinking of upgrading to 6gb because i game a lot and i'd love to play ksp with better performance.
also not so long ago i started developing in unity so it's becoming a must....
i need a better mac.
Had the same problem with my 20" 2.0 Mid-2007 - MA876LL iMac 7,1 A1224 2133
The system came with 1GB and tried to upgrade with a 2GBx2 A-tech kit sold by Amazon specifically for this alu iMac. When attempted to run the system I got a beep sound and the computer didn't start. Retried with 3 GB (tested both modules) and worked just fine.
I decided to give a try to the OWC 6GB (4+2) upgrade and for some reason it worked flawlessly. I even tested with the 4GB and the original 1GB kit and got the system running on 5GB too. I'm not sure what is special on the OWC upgrade but it will work.
Seat memory correctly? clean up memory sockets and reseat RAM could solve the problem.
Hey, papo_md
I am new to this forum and this is my first entry. Having recently bought 4GB of RAM (2x2) for my sons' mid '07 iMac 7,1 20" 2.0Ghz computer, and encountered the same problem of it not booting in the 2x2 configuration as you and others, I am intrigued by how you got yours to work with 4+2 and 4+1 configurations. I'm not technically competent, and am still confused as to what is the correct RAM to get. In relation to that, I'd be grateful if you can advise whether your iMac RAM that does work in the 2+4 combination is 667Mhz or 800Mhz ? The comments I have read suggest this is the most important factor.
Thank you and every else for their input.
Has anyone been able to upgrade a mid-2007 20-inch to 4GB?
