Now all we need is a real honest to God virus and the Apple drive to make Windozers feel right at home will be complete.
My first reaction to Lion remains the same. Install it, create a complete multi-layered recovery strategy, then use the computer.
I have heard mentioned else where on this forum that Lion allows you create a recovery partition on the HD for just such an occasion. Had you done that?
Otherwise be sure that Caps Lock has not been accidentally triggered and also make sure a modifier key (option or shift) is not stuck in the depressed position.
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Do NOT Touch this computer!!! Touching this computer WILL cause irreversible brain damage.
It's Un-Canadian to oppose a warming trend.