Giriş
Here are detailed instructions showing how to turn your iMac 4,1 into an iMac 5,1. I'm filling in some gaps in this procedure for upgrading a 2006 iMac.
I replaced the Core Duo T2600 CPU in my iMac4,1 with a Core 2 Duo T7600, which is the fastest replacement CPU for this iMac. I bought the replacement CPU on eBay for $25.89 from an overseas seller. The price was right but it took almost a month for the CPU to show up in my mailbox.
After replacing the CPU and updating the firmware, the resulting computer is equivalent to an iMac 5,1. It is now possible to install 4 GB of RAM, though the computer can only address 3 GB.
The best reason for upgrading the CPU is to be able to install MacOS X 10.7 Lion. This is surprisingly tricky to do.
Neye ihtiyacın var
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Loosen the two Phillips screws securing the access door to your iMac.
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Remove the access door.
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Remove the following screws along the lower edge of your iMac:
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Three 6 mm T8 Torx screws
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One 8 mm T8 Torx screw (Right side of the RAM slot on 2105)
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Insert a plastic card up into the corner of the air vent slot near the top of the rear case.
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Push the card toward the top of the iMac to release the front bezel latch.
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Pull the front bezel away from the rear case.
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Repeat this process for the other side of the front bezel.
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If the bezel refuses to release, try lifting the lower edge of the front bezel slightly away from the rear case (detailed in the next few steps) and repeat the latch release process.
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Lay your iMac stand-side down on a flat surface.
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To lift the front bezel off the iMac, simultaneously:
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Use your thumbs to press in the RAM arms and hold the iMac down.
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Use your index fingers to pull the small bridge of material on the front bezel toward yourself.
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Pull the front bezel up with your index fingers.
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Once the small bridge of material has cleared the RAM arms, lift the front bezel by its lower edge just enough to clear the bottom edge of the rear case.
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Remove the two 5 mm T6 Torx screws securing the display data cable connector to the logic board.
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Pull the display data cable connector up off the logic board by its black pull tab.
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Remove the single T10 Torx screw securing the left speaker to the rear case.
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Pull the left speaker out of the rear case.
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Disconnect the HDD fan and power button from the logic board by pulling their connectors straight up off the sockets on the logic board.
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Remove the 6.1 mm T8 Torx screw from both sides of the heat sink nearest the logic board (two screws total).
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The CPU is mounted in a Zero Insertion Force (ZIF) socket. If you (gently!) try to pull the CPU out of its socket, you will find that it does not budge. You first need to release the chip from the socket. Turn the screw on the CPU socket 180 degrees counter-clockwise to release the old CPU. Then pull up on the CPU chip to remove it.
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Insert your new CPU into the ZIF socket. Note that two pins are missing from one corner of the grid. Match that corner with the corner of the socket that is missing the corresponding holes. Drop the chip in; it should go in without effort. Rotate the screw on the socket 180 degrees clockwise to lock the new CPU in place.
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When reassembling don't forget to scrape off the old thermal paste and apply a new dose. The iFixit guide is good, but I was too cheap/impatient to follow those instructions. Instead I used a q-tip to swab rubbing alcohol on the heat sink and chip tops. Then I put on a dab of leftover heat sink paste that came with a CPU cooler for my PC.
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Download the iMac41-iMac51 firmware updater from netkas.org. You have to register (free) before you can see the download. Follow the instructions there to update your firmware. After rebooting, your iMac4,1 now reports that it is an iMac5,1!
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Here is a link for purchasing MacOSX 10.7 from the App Store. Wait a few days to receive the download key. The App Store will not let you download the Lion installer on your modified Mac. Download it instead from a newer Macintosh, by clicking the Download button under Purchases. Ignore any warnings. Find the download in /Applications.
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Installing Lion on your modified Mac is surprisingly tricky. I used the instructions in posting #8 on this page
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After booting into Lion, do a Software Update to bring your Mac up to date.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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5Kılavuz Yorumları
So I basically performed this: https://www.tekrevue.com/stayin-alive-up...
EXCEPT it does NOT boot with the new CPU in it. It is already an iMac 5,1 with the newer Firmware and already recognizes the 4GB of RAM and already has the latest Firmware version as well from Apple. It boots with 10.9.5 on a SSD with all the modified kexts etc. everything works based on what it can do. the CPU is the ONLY variable that causes problems. There is NO boot chime, the fans spin up super fast and loud. There is also NO screen display as well. Attempting to do CMD+OPT+P+R has no effect with the newer T7600 2.33 installed. I even swapped out the RAM module between single installs 1 at a time and in different banks, no change. And I only get 2/3 LED 1&2 of the lights that come on not LED 3. But it does come on with the original CPU. Any thoughts would be greatly appreciated, thanks.
My only experience is with EMC2105, not EMC2118 (I inherited EMC2118 from an existing guide that I leveraged). I wonder what would happen if you downgraded your firmware to an iMac 4,1 and then performed the CPU upgrade procedure. That might work if the firmware installer detects the CPU and does some CPU-specific setup. On the other hand, that would be risky as it might brick your system. I’d probably just live with the slightly slower original iMac 5,1 CPU (T7400 at 2.16 GHz) unless you feel lucky or want to contribute to the collective knowledge.
Yes, an SSD will work. There’s even a repair guide (authored by someone else) explaining how to install a new hard drive or SSD. iMac Intel 20" EMC 2105 and 2118 Hard Drive Replacement
