Problem after installing firmware 1.4... please help!

Hi all, i recently upgraded to firmware 1.4 (the recent available version)... and now, every few minutes the fan generates big noises (also generating heats around the speaker area)... i looked into the Activity Monitor and i found that there are some processes that are actually using up >50% CPU usage, but the strange thing is, i wasn't using these softwares at all...
the reason why i said it is a problem with the firmware upgrade is that, this problem didn't happen to me before upgrading.. and beside this upgrade, i didn't install any other software thereafter...
can some body please help me? is there anything i can do? or can i restore the firmware back to the previous version? thanks in advance.

Thanks Sweet Polly. But the fireware restoration they talked about on that page is only for those who had problem DURING the fireware installation. "Note: This CD cannot be used to return an Intel-based Macintosh computer's firmware to a previous version if a successful update has already been performed.". i've got the fireware 1.4 successfully installed, and i want to restore it back to my previous version...

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