Hi everyone!! I'm new here and I would help from you. I have one iMac G3 333Mhz since 1998. It never had problem but during 1 or 2 years I won't had turned on. Now, I tried to turn on... The iMac has turned on but the USB ports don't work and I want to install a new OS X. I can't start with "C" key or with CD-ROM. Maybe the USB ports had been oxided. Now... how can I fix it to work again? I was thinking to change the original logic board per one iMac 600 firewire board. It's possible? Thanks for your help. I'm sorry about my English, but I try to improve.