Imac hanging during Lion upgrade

I have a 2010 27" imac. As of last night, it had Snow Leopard on it (as it was shipped with).
I tried upgrading last night with the Lion purchased from the App store.
The system now appears hanging with "approximately 21 minutes left" on the screen. The mouse works. The screen dims after X minutes, and will wake up with mouse movement. No keyboard inputs seem to work.
It has now been 12 hours stuck at the same point.
What's next? Power cycle? Hope for the best? I have plenty of backups, but I'm surprised that a newer system is having this problem but I can't seem to find others who also had it.

I did do the above as I read that may work too, I also made it so the HD never sleeps. Did not help for me, computer still freezes when switching accounts, not all the time, on average every other day I need to do a hard restart.
Still looking for the answer

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IMac 27" with Lion upgrade ... daily hangs! Need help and support

Dear Apple,
Mid-July we got an iMac27" with Snow Leopard installed. First week of August I upgraded to Lion via web download (from Apple Store).
Since then the iMac has frequently hung. It goes in two stages: 1) the cursor gets round with rolling colors for some time (the "force quit" or "shutdown" menu selections cannot be accessed because the mouse gets inactive for clicks), then 2) the cursor gets in the middle of the screen and resembles the gray round that rotates when the iMac starts up (but without the gray apple above it this time) ... it stays in that mode indefintely. I then have to shut it down via the back lower left button and start again. Now it goes into that "routine" almost daily.
All softwares are up-to-date. I have also performed three of four times now the "Alt at start" manoeuvre, check disk and permissions with repair.
Is it because of the Lion upgrade (instead of a fresh install)? (If so, how do I perform a fresh install and keep all settings/preferences.) Is it hardware-related ... although it looks like working quite good? Is it software-related ... how to clean everything?
In case such issue has not yet come up I will need to call the Apple help center. Can a phone number be provided? Thanks.
Regards.
Pierre

Your situation sounds identical to mine. But, with a 27" 2010 iMac and a 2009 Mac pro. Constant freezes, hangs, programs not quiting, unable to restart , shutdown.
I did a full re-install of Lion on both the iMac and Mac pro, including a full initialization of he disk, and, instead of migrating all my apps and data from time capsule, I individually re-installed each app.
Nada!..same problem..
On this past Monday, I reformatted my Macpro and re-installd Snow Leopard - it works perfect now!
Lion has got to be the worst product Apple has ever released. I have no idea why it works on so many Macs, when it seems to be so bad on many as well.

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I did do the above as I read that may work too, I also made it so the HD never sleeps. Did not help for me, computer still freezes when switching accounts, not all the time, on average every other day I need to do a hard restart.
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Imac hanging during Lion upgrade

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