My mid 2007 iMac doesn't recognise 2GB RAM module in DIMM/1

I am trying to upgrade the RAM in my mid 2007 iMac from 1GB to 4GB. It originally had a 1GB module in slot DIMM/0 and nothing in slot DIMM/1. I inserted the two new 2GB modules, one in each slot but DIMM/1 just reports as being 'empty'. I have tried swapping the modules and different configurations of 1 & 2GB modules but DIMM/1 only reads the original 1GB module (from DIMM/0) and reports 'empty' when either of the two 2GB modules are installed.
I have reset PRAM, checked EFI firmware update and updated OSX to version 10.6.8 (from 10.5.8) but still the same result. The best I can get is 3GB (2GB in DIMM/0 and 1GB in DIMM/1). I am definitely pushing the modules firmly into place. Is there anything else I can try?

Your machine will accept up to 6GB of RAM however you must a) have the correct specifications, no variations at all and b) must push hard with both thumbs to fully seat the RAM. The correct RAM for your system would be the specifications shown here. I suspect 1 of three things with the RAM you bought.
1. Wrong specifications!
2. Incorrectly installed
3. Defective RAM
I would STRONGLY recommend using Crucial or my preferences OWC, which is the memory shown in the link.
BTW I have a late 2007 24" 2.8GHz iMac with 6GB of RAM.

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Is there any way to upgrade my mid-2007 imac to more than 4GB RAM?

From what i've read it sounds like 4GB RAM is the most that my iMac is capable of using, but i' m hoping that isn't true. even though it operates plenty fast for my current needs, it would always be nice to have the option. any info will be appreciated. thanks.
current 'about this mac' :
iMac
24-inch Mid-2007
Processor 2.4 GHz Intel Core 2 Duo
Memory 4 GB 667 MHz DDR2 SDRAM
Graphics ATI Radeon HD 2600 Pro 256 MB
Software OS X 10.8.1 (12B19)

Yes, 6GB is possible...
Hardware Overview:
Model Name: iMac
Model Identifier: iMac7,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 6 GB
Bus Speed: 800 MHz
As Seventy One mentions... OWC.

4 hrs later - Computer shut down after installing new RAM (mid 2007 Imac)

Mid 2007 imac and I installed new Ram. It worked for 4 hrs then the Imac shutdown. The pressed power button but no power. Unplugged and replugged the power cord and 3 beeps sounded. I am wondering if it worked for 4 hrs or so, then why did it would it fail 4 hrs later?
I am running the correct ram because in system profiler under memory - it said that everything was ok.
Any ideas?

or maybe the back tray wasn't tight enough?
I re-installed it now and so far so good.... I pressed tight and in an upwards motion. We'll see what happens

How well does OSX Yosemite run on a Mid 2007 iMac?

I own a Mid 2007 iMac with 4GB 667Mhz DDR2 RAM, Intel Core 2 Duo 2.0Ghz processor and has ATI Radeon HD 2400 XT 128 MB graphics. I was considering upgrading from OSX Mavericks 10.9.4 to OSX Yosemite, but fear it may slow the Mac down. If anybody has upgraded their Mid 2007 iMac, does it slow the system down? Thank You.

Hi JRos23. Thanks for sharing your experience.
I also have a mid 2007 iMac (2.4 GHz Intel Core 2 Duo) and I'm waiting on reviews like yours to evaluate if it is worth to take the leap and update. Last year I updated to Mavericks from Lion (skipped Mountain Lion) and it improved a lot on many fronts. However, it only felt smooth when I updated the RAM to 6GB. Apple specs tells us that this machine supports max 4Gb, though I found many people saying that it would support 1x2GB + 1x4Gb, and it does. I trully recommend it. If it helps anyone, I bought these: link (sorry, Spanish Amazon store).
However, seeing that you're having a good enough experience until now I will definitely consider it as near future project, maybe with 10.10.1. Is it really an improvement or are there any daily usage setbacks?
Cheers,
JP

I want to dual boot Windows 8 on my 20-inch, Mid 2007 iMac, from an external USB drive.

I want to dual boot Windows 8 on my 20-inch, Mid 2007 iMac, from an external USB drive. The internal drive is completely dead, it doesn't even show up in Disk Utility. I'm running 10.8.2 from the external drive. When I start Boot Camp Assistant, at the Introduction page, when I press the continue button nothing happens. Do I have to have internal drive to run Boot Camp Assistant? Can anyone provide me with the steps to dual boot, with his setup? Thanks in advance!

Hi maczimillon,
Only follow these steps, it works for my:
Open "System Information" and note your "Boot ROM Version" (some like MBP51.007E.B06)
Navigate to "Utilities" in Finder and open the package contents of -BootCampAssistant.app- with right click. Duplicate the "Info.plist" file to the Desktop e.g. and open that with Text Editor.
You must locate the keys "DARequiredROMVersions"and "USBBootSupportedModels"
Add new strings with the information of your machine under booth keys (step 1), always respect the format, such as: <string>MBP51.007E.B06</string> for the frist key and <string>MBP51</string> for the second key.
Save changes and replace the original plist file (it may ask you to enter admin pass)
If you proceeded correctly you will see the checkbox "Create a Windows 7 USB install disk" enabled in Boot Camp Assistant.
Then you can follow the usual Boot Camp installation using your WIN8 DVD iso image . The assistant program will proceed resizing your disk partition and installing necessary drivers for your iMac.
I strongly recomends you to use thirld party's bootloaders like rEFInd (rEFIt) because of the Apple SMC versions of some old machines should not be able to boot properly from external devices like USB drives.

Can I use faster memory in Mid-2007 iMac?

I currently have factory spec (1 GB) memory in my 20" (Mid-2007) iMac. Specs for memory in this machine say I need pc2-5300, unbuffered, non-parity, 200-pin, 667MHz DDR2 SDRAM. I noticed my hardware has an 800 Mhz bus.
1) Can I use 800 Mhz RAM that is otherwise the same spec?
2) How important is CAS Latency (e.g., the installed memory is spec'd as CL=5, the 800 Mhz RAM all seems to be CL=6)?
Any help is greatly appreciated!

I totally agree with lenn5! Many folks here in the forum have reported all sorts of problems, everything from kernal panics to won't even boot when they installed the 800MHz ram. You will see a great improvement in performance by adding another 1GB or 2GB module in the empty slot, or max it out with a 2x2GB kit.
http://support.apple.com/kb/HT1423?viewlocale=en_US
Message was edited by: den.thed

How do I clean my mid 2007 iMac? The disk space is running VERY low and I would love an idea. I make videos and upload them to youtube and I need space to do that. Thanks for your time!

How do I clean my mid 2007 iMac?
The disk space is running VERY low and I would love an idea. I make videos and upload them to youtube and I need space to do that. Thanks for your time!
If you have an idea please respond!

You should never, EVER let a conputer hard drive get completely full, EVER!
With Macs and OS X, you shouldn't let the hard drive get below 15 GBs or less of free data space.
If it does, it's time for some hard drive housecleaning.
Follow some of my tips for cleaning out, deleting and archiving data from your Mac's internal hard drive.
Have you emptied your iMac's Trash icon in the Dock?
If you use iPhoto, iPhoto has its own trash that needs to be emptied, also.
If you store images in other locations other than iPhoto, then you will have to weed through these to determine what to archive and what to delete.
If you use Apple Mail app, Apple Mail also has its own trash area that needs to be emptied, too!
Look though other Apple Mail folders like the junk mail and delete the mail that is in there. Look through your sent items folders and see there is any mail in there that can be deieted.
Delete any old or no longer needed emails and/or archive to disc, flash drives or external hard drive, older emails you want to save.
Other things you can do to gain space.
Once you have around 15 GBs regained, do a search, download and install OmniDisk Sweeper.
This app will help you locate files that you can move/archive and/or delete from your system.
STAY AWAY FROM DELETING ANY FILES FROM OS X SYSTEM FOLDER!
Look through your Documents folder and delete any type of old useless type files like "Read Me" type files.
Again, archive to disc, flash drives, ext. hard drives or delete any old documents you no longer use or immediately need.
Look in your Applications folder, if you have applications you haven't used in a long time, if the app doesn't have a dedicated uninstaller, then you can simply drag it into the OS X Trash icon. IF the application has an uninstaller app, then use it to completely delete the app from your Mac.
Download an app called OnyX for your version of OS X.
When you install and launch it, let it do its initial automatic tests, then go to the cleaning and maintenance tabs and run the maintenance tabs that let OnyX clean out all web browser cache files, web browser histories, system cache files, delete old error log files.
Typically, iTunes and iPhoto libraries are the biggest users of HD space.
move these files/data off of your internal drive to the external hard drive and deleted off of the internal hard drive.
If you have any other large folders of personal data or projects, these should be archived or moved, also, to the optical discs, flash drives or external hard drive and then either archived to disc and/or deleted off your internal hard drive.
Good Luck!

Problems with Installing 4GB RAM on mid 2007 iMac

I ordered 2 X 2GB sticks of PC2-5300 DDR2 SODIMM RAM for my Boss's mid 2007 iMac from Crucial.com. Well they arrived a few days later and today I have been trying to install them for a few hours now without any luck. I have installed new RAM about 5-6 times without any problems before on different MacBooks and iMacs. After this install I plugged back into the wall and hit the power button, the iMac made a little noise (internal noise) then nothing, just a blank screen. I thought maybe the RAM was bad so I inserted 2 other chips (we ordered 4 X 2GB to upgrade 2 iMacs) and still no luck. After making sure the iMac would boot with the old RAM (which it did), I tried installing 1 X 1GB with 1 X 2GB and it booted up perfectly. I did this with all four 2 GB RAM chips to make sure they all worked and they did. Each time I successfully booted, I went to the system profiler to make sure it recognized 3GB of RAM and it did. So my question is why is this mid 2007 Aluminum iMac not working with 4GB of RAM, but it works perfectly with 3GB? Thanks in advance, sorry for the long question.

+It seems to me that it is not just a problem with the RAM but with the imacs themselves.+
How does this make any sense when one considers that Apple successfully specified, produced, sold and delivered all three iMac (mid 2007) models with an optional 4GB of RAM pre-installed?
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I received my two orders of upgrade RAM from Micron/Crucial even before I had purchased my 24-inch iMac, and it's worked great ever since I installed it. I also installed the second half of that order into my current MacBook, purchased a month after the iMac, and it's also been working great ever since. These are certainly superior Apple products.
Obviously there has been a change in RAM manufacturing design at Micron, probably due to their change-over to the costly, challenging high-tech 50nm and 40nm manufacturing technologies, and it is nothing more than Micron's problem.
Message was edited by: myhighway

Mid 2007 iMac SSD in optical bay - cannot write to last block of device

Hi All,
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ds store wrote:
3. The new disk is just bad.
OK. If that's the case, I'll just get another disk.
Lots of problems with that hybrid drives on Mac's on these forums, get another one that's 7,200 RPM and from Western Digital, not Seagate.
With a 7,200 RPM you get more performance across the entire drive, not just what's cached in the small flash portion of the hybrid.
https://discussions.apple.com/community/notebooks/macbook_pro?view=documents#/
1. Hybrid drives: I'm on number 8 in 6 different machines, no problems at all, what happens when you try?
2. The OP is not using a Hybrid.
3. Lot's of problems with WD drives not booting on these forums though.

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HT4241 Does dvi to HDMI adapter works on mid 2007 iMac? Some how my iMac detect the sharp tv but the tv screen is black.

Does dvi to HDMI adapter works on mid 2007 iMac? Some how my iMac detect the sharp tv but the tv screen is black.

you need mini dvi to hdmi cable
http://store.apple.com/us/product/M9321G/B/apple-mini-dvi-to-dvi-adapter?fnode=5 1
and
http://store.apple.com/us/product/HA835ZM/A/belkin-hdmi-to-dvi-d-cable-2-m66-ft? fnode=51

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Freeing Up Space on The Hard Drive
1. See Lion/Mountain Lion/Mavericks' Storage Display.
2. You can remove data from your Home folder except for the /Home/Library/ folder.
3. Visit The XLab FAQs and read the FAQ on freeing up space on your hard drive.
4. Get an external hard drive on which to store some of your files after which you can
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ONL

Mid 2007 iMac 2.4GHZ. after start up the iMac will slow down to a freeze. Specially while on internet (youtube).

mid 2007 iMac 2.4GHZ. after start up the iMac will slow down to a freeze. Specially while on internet (youtube).

See:
Mac Maintenance Quick Assist,
Mac OS X speed FAQ,
Speeding up Macs,
How to Speed up Macs,
Macintosh OS X Routine Maintenance,
Mac troubleshooting: What to do when your computer is too slow,
Essential Mac Maintenance: Get set up,
Essential Mac Maintenance: Rev up your routines,
Maintaining OS X,
Five Mac maintenance myths and
Myths of required versus not required maintenance for Mac OS X for information.

My mid 2007 iMac doesn't recognise 2GB RAM module in DIMM/1

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