Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

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iMac Freezing During Re-installation of OS X

iMAC 8. 1 Early 2008

My iMAC 8.1 had started freezing up. I was running Leopard 10.5, ordered and installed Snow Leopard 10.6. Then proceeded to do the additional updates - after each update the machine would freeze at the end of the update. Would have to reboot. Once the machine was up and running , I would check what was the version of the OS - and it would show that the update was successful.

After the updates the machine would still freeze and would have to reboot. I upgraded the memory to 4GB and replaced the harddrive with a 1TB SATA drive. I used the Snow Leopard disk and successfully installed the OS. But, during the account creation process the machine still freezes.

What other hardware issue do I need to investigate?

Answered! View the answer I have this problem too

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Which is your system? Review this list: iMac8,1 Please tell us which.

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Please tell us the make and model of HD you put in.

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1. Yes the machine was freezing prior to the install of the new harddrive.

2. Upgraded memory to 4GB first - still was freezing

2. Machine is iMAC 8.1 MB325LL

3. Installed a new Seagate 1TB 7200 rpm SATA harddrive

4. It went thru the partioning process fine

Thanks in advance

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OK, I corrected your model info so you can click on the system to the right to get to the guides.

Here is your systems specs: iMac 24" 2.8 GHz Core 2 Duo (Early 2008)

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Seagate make many different drives can you give us the exact model. Take a picture of the drives box or the drives labels if you're not sure and paste it here in a fresh answer so we can figure things out.

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I think you'll need to run the onboard diagnostics. Follow this Apple TN: How to use Apple Hardware Test on your Mac. Let us know what it tells you. Clearly you still have a deeper problem.

Reference: Startup key combinations for Mac

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Sorry have been on the road and couldn't on the MAC. But I cannot get the diagnostics to run with pressing D or CMD D - is there a way to download and use , or create a bootable disk?

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Bummer, so you don't have the grey installation disks then which it the last method. Do you have a second mac system to create a bootable USB thumb drive so you can update the systems firmware? Here's the Apple T/N on upgrading: About EFI and SMC firmware updates for Intel-based Mac computers as I suspect your EFI is older.

Did you set the SATA II jumper on the drive to lower the SATA speed?

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My iMac, Boot ROM version, and SMC version are not listed as having firmware updates available. Since the hard drive doesn't seem to be an issue. what if I put the old hard drive back in - would the diagnostics be on the original drive, or are they only on the original install disks?

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At this point I guess thats the only thing left.

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1st: Did you had this problem before changing the hard drive?

2nd: If the answer for the above question is NO, than 95% is a hard drive problem.

So you need to change the hard drive.

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Dustin Brock will be eternally grateful.
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