My iMac (mid-2011) does not start and AHT is OK

I had a similar issue last June and after I carried my iMac to Genius bar, they decided to replace the HDD on warranty. It solved partially the issue but after uninstalling flah player, everything was fine. So, 3 days ago, when this problem occured again, I uninstalled and reinstalled flash player.
But this time, it solved the problem only for one day (it should mean that is is not related to 'Flash"), and I have not been able to start it ever since.
I tried all kinds of resets and ran a bunch of tests with no result.
When I do the AHT (Apple Hardware Test) from disc2 , result is perfect and AHT does not find any hardware problem.
I tried to boot from disc1 (installation disc) but no way to boot. It could be that I  have updated OSX 10.6 to Lion 10.7 and disc is 10.6???
It seems I am stucked. Any idea will be welcome

Have you tried a safe boot, by holding the shift key down as you boot?  That will take longer than a regular boot, as it's doing some disk maintenance. If that works, try a normal boot.

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