Gray bar under Apple logo during startup with 10.7.2

Hi everyone,
first-time iMac owner since May 2011, I'm experiencing exactky the same problem described in the article Mac OS X v10.6: Gray progress bar appears under Apple logo during startup, but with two important differences:
it never happened with the original the 10.6 factory-installed, and started to appear after upgrading to 10.7 at the beginning of August
my iMac, included in the HD replacement program announed by Apple in July 2011, had the HD replaced with a new one in October 2011
In addition to the behavious described in the KB article, it's worth noting that, when one finally manages to log in (and the gray bar may take one good minute to disappear, which happens after filling up to approx. 60-70% of its length), the iMac is barely unusable, as the graphic interface is suddenly **** slow and there's a lot of flickering.
Since seeing is believing, please have allok at the YouTube video I made on this "false start", as I named it: see iMac_falsa_partenza / iMac_false_start.
I had already reported the problem to the local assistance, and they had told me it was an evidence of the HD problem indicated by Apple. Then they replaced the HD (...did they, actually? Probably yes, as the HD now installed is far noisier than the old one), but the very same day I brought it back from the assistance, at the second start... bam, here's the nasty gray bar again.
I didn't further report the problem to the assistance because my faith in their capability has cracked and because the simple replacement of the HD took them three full weeks. But this "false start" issue really, really bothers me a lot, as it happens every other day.
How can I have some good Apple expert technicians take this problem seriously and help me solving it?
As a first-time owner of a Mac, I have onestly to say I'm much, much disappointed by this story... Thanks anyone for any help.

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