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

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Kernal Panic/Hard Drive Installation

I have a 24" A1225 iMac. I have recently suffered a failing hard drive (WD3200AAJS, 320GB). I bought a replacement from Fry's (and it was compatible to my machine, so they told me). Seagate 500GB. The drive is thinner. I went with Seagate because of my good history with the drives (WD , not so much). I installed the HD (simple) and carefully without any issues.

I formatted the HD, and installed a restore from time machine. Immediately (well, after three hours) installed without an issue.

Upon restart immediate kernal panic, one after another actually. I tried PRAM, SMC, AHT, and nothing. It boots right into this kernal panic, and even in safe/verbose mode. I took the drive out and I am now erasing and reformatting it with my other machine, and running some tests. I contacted three outside stores and two said that drive works with iMac, and OWC said it will NOT work with my machine. I can still return the Seagate and get a WD, however I am not sure the brand matters - anyone know?

I am not sure what the issue is now. I have checked logic board (fine), RAM (new and fine), and the new HD is not loading. I believe one of two things - 1) New HD is failing or 2) the time machine backup is corrupt. Any ideas or suggestions are appreciated.

Answered! View the answer I have this problem too

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Sounds like you have a SATA I/O speed mismatch problem.

You see your system has a 3.0 Gb/s SATA II HD interface while the HD you have chosen may have a 6.0 Gb/s SATA III interface on the drive. While some systems and HD's can auto-negotiate some can't.

Heres the WD spec sheet for your original HD WD3200AAJS Review the SATA version info.

As you didn't offer the model info for you newer drive I can't confirm if this is the case here. But the symptoms suggest it. If you can give us the model info we can see if you can use it as some have a jumper which can lower the I/O speed. Otherwise you'll need to get a new HD and make sure it is not to fast or has a means to slow the I/O speed down.

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