Freezes after upgrade

My Mac Mini freezes a lot and sometimes the login cube don't stop spinning after upgrading to latest firmware. How can I solve that?

It sounds like something you have installed that boots drivers did not expect the firmware to change.  You can verify this by seeing if safe mode boots.  If it still has problems booting, then the firmware was not applied correctly, or there was already a hardware problem present that the firmware update simply brought to light.  Run then the hardware test that came with the Mac:
http://support.apple.com/kb/HT1509
If there is nothing detected, it could still be a physical RAM issue. If the boot from safe mode works, then you need to eliminated all non-Apple hardware from the boot, and discover if any installed drivers aren't known to be compatible with that firmware by checking with their vendors.

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    I've not heard of this kind of problem before. How did you format it?
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    Message was edited by: S.U.

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