Login Screen freezes after Lion 10.7.2 upgrade - needs 3 hard reboots

Just upgraded my 21.5" late 2009 iMac to OS X Lion 10.7.2.
0. Power up from cold start: login screen appears, and mouse works, but clicking on users does not bring up the password box. No option except for hard reboot.
1. Hold down power button until it shuts down. Power up, still no respponse (see 0.).
2. Hold down power button until it shuts down. Power up, still no respponse (see 0.).
3. Hold down power button until it shuts down. Power up, responds normally, can login (or start computing if login screen is bypassed).
I saw messages (mostly for MacBook Pros) dating back to July/August 2011 with similar problems. But none for 10.7.2, and none where it consistently takes 3 hard reboots to get a response. I tried all of the suggestions that applied: SMC reset, repair disk permissions, change password, bypass login screen. If I use automatic login, it boots up into my desktop and all the services seem to start. The mouse works, but nothing responds when I click on it (see 0.).
Any ideas?
thanks,
david

Thanks lynque. It turns out I did need a keychain repair, but that didn't fix the problem. I probably should have done this earlier, but I ended up unplugging all peripherals (2 firewire + 3 USB) then powered up without issue.
So I shut down, plugged in one at a time, and ran into the problem again after plugging in an external hard drive (WD My Book Essential). I repaired with disk utility, but the problem remained.
I then rebuilt the partitions with Disk Warrior, and now everything seems to work....

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Meg,
I sent it to my exchange family in Chile. It was packaged so well, tons of bubble wrap, it couldn't have been damaged.
I worked for a professional camera company in Chicago. Our test for how well a sensitive camera part was packed was to take it to the 3rd floor and toss it out the window. Now that sounds rather radical but I've seen packages drop off the loading belt of a 747 straight down to the tarmac. The midline of that plane is about 31'. So once you see that happen our test was not so unreasonable.
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I sent it to my exchange family in Chile.
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Login Screen freezes after Lion 10.7.2 upgrade - needs 3 hard reboots

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