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New iMac: 4GB RAM upgrade does not boot

4190 Views 7 Replies Latest reply: Oct 12, 2007 7:49 PM by jlapro RSS
Gravity Level 1 Level 1 (5 points)
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Oct 7, 2007 6:37 PM
I have a new 24" 2.8GHz Intel Core 2 Extreme iMac. Bought the Crucial 4GB kit. Installed both sticks, but the iMac would not boot. I heard the hard drive spinning, but it would not boot. I removed a stick from the first slot ("first" from left to right looking at the screen), and inserted the 1GB oem stick. It booted fine. I thought I had a DOA 2GB stick, so I returned it to Crucial. Got my new replacement memory and tried again. Still would not boot. Switched slots. Same problem. Replaced the OEM 1GB in the first slot again, it it booted fine. I tried every configuration, and the only thing that works is the 1GB OEM in the first slot and one 2GB Crucial stick in the second slot. I cannot get 4GB of RAM to work. Any suggestions?
  • den.thed Level 7 Level 7 (23,325 points)
    Currently Being Moderated
    Oct 7, 2007 7:48 PM (in response to Gravity)
    With the orginal 1GB and a 2GB module installed are you seeing all 3GB in "Apple / About This Mac" and Reading system memory usage in Activity Monitor?

    Resetting the PRAM can solve certain startup problems.

    Try installing the 2x2GB kit and restart the Mac immediately press Command-option-P-R and hold the keys down until the Mac chimes a second time. This resets the information in the Mac’s parameter RAM (PRAM) to its default values. The PRAM is a special area of RAM where data is retained even after you shut down the Mac.
    17" iMac Intel Core Duo - 2GB Ram -, Mac OS X (10.4.10), - Maxtor 300GB FireWire - 2G Nano
  • den.thed Level 7 Level 7 (23,325 points)
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    Oct 7, 2007 8:11 PM (in response to den.thed)
    Sorry for the double post, but I also got to thinking that maybe some how you got the wrong modules. Double check the spec's of that kit they should be:

    PC2-5300
    Unbuffered
    Nonparity
    200-pin
    667 MHz DDR2 SDRAM

    iMac (Mid 2007): Installing or replacing memory
    17" iMac Intel Core Duo - 2GB Ram -, Mac OS X (10.4.10), - Maxtor 300GB FireWire - 2G Nano
  • CDSoundzDJ Calculating status...
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    Oct 8, 2007 10:54 AM (in response to Gravity)
    Why wont the 800MHz RAM work? The FSB on the new iMacs are 800.

    Sound silly to me that you have a faster FSB but bottleneck at the RAM.

    Perhaps the new OSX will allow the iMac to use the full 800.
    2.4GHz Intel Core 2 Duo, Mac OS X (10.4.10), Aluminum iMac 20"
  • den.thed Level 7 Level 7 (23,325 points)
    Currently Being Moderated
    Oct 8, 2007 3:53 PM (in response to Gravity)
    Glad to hear that we were able to find the problem!
    17" iMac Intel Core Duo - 2GB Ram -, Mac OS X (10.4.10), - Maxtor 300GB FireWire - 2G Nano
  • jlapro Calculating status...
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    Oct 12, 2007 7:49 PM (in response to Gravity)
    I bought a 2g ram module from OWC and it was not recognized in my recently purchased 2.4ghz 20" imac. I returned the first one and the second they sent me has the same problem. I don't believe it's how I'm installing it - I've moved the OEM 1g module from one slot to the other and that continues to show up. If I try to boot up with just the 2g module I just get a beep. OWC says there may be something wrong with the memory controller and suggests I get it checked at the Apple store.
    G4 quicksilver, Mac OS X (10.4.3)

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