hello I recently purchased a Mac Mini Core duo 1.83ghz to use as mediaplayer in my living room. I noticed that i wasn't able to use any keys during startup, trying to reset the PRAM. Later on, when i replaced the standard 80gb harddrive with a bigger one and trying to use the "C" during startup, i found out t that i can't use any key during startup. I learned that a firmware-password blocks all keys during startup, except alt-option-f-o to enter the open firmware, but i can't even enter the open firmware during startup. The mini simply doesn't respond to any key i try to use on startup. Once booted, the keyboard and mouse work both fine in Snow leopard. What can be wrong with my mini?