iMac A1225 Continuous Boot

After installing OS X Yosemite on new SSD drive, iMac is experiencing a continuous boot.

Steps taken:  

1)  Tried to boot to safe mode (press shift key) - unsuccessful; stops half-way during boot process.
2)  Command+option+P+R - Reset NVRAM.
3)  Installed OS X Yosemite on external drive thinking the new SSD had an issue.  Get the same result on the external drive when selected as boot disk.
4)  Disconnected un-needed peripherals, to include the network line before restart.
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According to:

"Your Mac might restart multiple times during installation to install related firmware updates. Once installation has finished, your Mac starts up from OS X Yosemite."
Justin BradshawOwnerCommented:
Do you still have the old drive you took out in favor of the SSD? If so, and if it still has the system on it, try to boot from it and see what happens.
carlosbracamonteAuthor Commented:
Strung - appreciate the link,  My initial thoughts were firmware updates; however, after numerous restarts Yosmite never started up.
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carlosbracamonteAuthor Commented:
Additionally, I connected the same SSD as an external drive on a mini-mac and was able to boot to Yosemite.
carlosbracamonteAuthor Commented:
Justin - will attempt to boot to the old drive.
Try booting in verbose mode by booting while holding down command-v. You may get a clue to what is happening from the verbose mode screen information.
You could also try running the hardware test:
carlosbracamonteAuthor Commented:
Tried the old drive with OS (same version as SSD) - same result - boot loop.  Even tried old drive on mini-mac with success, able to boot to OS.  

I also booted to verbose and did not see anything that looked suspicious.  

Ran the hardware test and the Apple Hardware Test (AHT) never executed.

Could I possibly be experiencing Kernal issues?
What were the last few lines of instruction in verbose mode before the reboot?

Have you tried resetting the SMC:
You probably need the system disks that came with your computer to run the hardware test:
Justin BradshawOwnerCommented:
You didn't do anything with TRIM or TRIM enabler, by chance did you?

If not, I'd take it to the Genius bar to have them do the hardware testing... or put the original HD back in the iMac and see if that works. Then we'll know it's something with the SSD being in there...
carlosbracamonteAuthor Commented:
Here is a screenshot of the instruction.  Tried thverbosee SMC reset, same result. Will need to locate the system disks.
carlosbracamonteAuthor Commented:
Didn't mess with the TRIM.  I did boot to the old drive and I get the same result.  Reason why I went with the SSD drive because I thought my old drive went bad.  I proved to be wrong because I am able to boot to the old drive on the mini-mac.
It sounds like a hardware problem.

Can you boot from a system DVD? Can you boot from an attached USB drive?

If you can boot from a DVD or an attached USB drive, the problem might be the hard drive ribbon cable.
Justin BradshawOwnerCommented:
Will it boot into Target Disk Mode? (holding down T at startup)
carlosbracamonteAuthor Commented:
Tried an attached USB drive and get the same result.  Using a USB EZ-Dock with the SSD and old drive inserted.

Definitely sounds like a hardware problem.  Trying to locate the systems disks that came with the iMAC.
There should be a hardware test on the second system disk.
carlosbracamonteAuthor Commented:
Seems to boot to target mode, however, the disk icon is not shown.  

May need to acquire the systems disks elsewhere, specifically the second disk as the original disks seem to be lost in transition of users.  This imac is used in the workplace.
It sounds like a firmware update didn't install correctly.  Are you able to boot into the Recovery partition?  The Yosemite update should have put a recovery partition that you can boot into with Command r.  If not, you're going to have to find the original discs and boot into them and try to recover the firmware, if at all possible.

Find the version of your Mac and look for the appropriate firmware.
Download the appropriate firmware.

Unfortunately, if you can't fix the firmware, you may have to take it to the Apple store to have them reload it for you.

Another thing to try is to reset the EFI firmware.  Reboot the computer and hold down Command Option o f during startup.  When you see the message "To continue booting, type 'mac-boot' and press return."  Then type mac-boot and press return
carlosbracamonteAuthor Commented:
I'm able to get to the recovery partition.  After selecting the partition in a couple minutes I get a voice response "to use English as the main language press the return key", I proceed to press the return key and then hangs about a quarter way through the progress bar under the Apple.

I found the appropriate firmware version, copied onto a disk. Attempted to boot to the disk without success via the Option key.  CD drive not shown, but primary and recovery partitions are.

Tried the Command Option O F keys immediately after boot and didn't get the message as indicated.
Since you can boot into recovery mode, try a Recovery of the OS.
carlosbracamonteAuthor Commented:
I get the same response when selecting recovery mode - After selecting the partition in a couple minutes I get a voice response "to use English as the main language press the return key", I proceed to press the return key and then hangs about a quarter way through the progress bar under the Apple.   Never completes the recovery, hangs up.

Looks like the Apple store is the next step.

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