Updated from Leopard to Snow Leopard, then upgraded to Lion, now my system is freezing on startup. Can anyone help?

Updated from Leopard to Snow Leopard, then upgraded to Lion, now my system is freezing on startup. Can anyone help?

Try a Safe Boot: Restart holding down the shift key until you (hopefully) see a grey progress bar. Once booted restart as normal from the Apple menu. Any change?
How much RAM do you have installed?

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