After updating from SL to Lion my iMac does not start

Hi,
after I updated from SL to Lion, my iMac did not boot correctly. It came to the apple and the turning wheel, or at the best up to the desktop and then the black screen > maschine was off. I repaired the HD, after 6-7 trials, I reached a very slow Lion environment, not satisfieying at all. I installed Lion again, no change. Now I can only use the iMac after star with shift key, i.e. protected mode.
Any idea what to do?
Rgds
flying_2000

Imagine calling to your Doctor and saying "I'm unwell. Please advice (sic)"? What would he say? I think he'd start by asking a for a whole lot more information, wouldn't he? So, same here.

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Take each of these steps that you haven't already tried. Stop when the problem is resolved.
To restart an unresponsive computer, press and hold the power button for a few seconds until the power shuts off, then release, wait a few more seconds, and press it again briefly.
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