I Mac doesn't start up after OS Leopard reinstallation

Hello,
I had Kernel issue and had to reinstall OS Leopard.
After successful reinstallation, I restarted my I Mac, however, it doesn't start up completely and keeps loading for the last 6 hours.
Please could you advise what is the issue and how to handle it?
Thanks, Igor

First of all, do you have a working back-up of all your files?
Do you have any devices connected other than keyboard/mouse/trackpad? If so, try starting with them disconnected.
If that didn't work, and I know you've tried some of these things already, I think I would have one last go with:
Resetting the SMC & PRAM:
SMC Reset
Shut down the computer.
Unplug the computer's power cord and disconnect attached devices.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
Reset PRAM
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P and R.
You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
Another go at a Safe Boot:
http://support.apple.com/kb/ht1455
And if that fails re-install the OS using the Recovery HD. Good luck.

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