So, I just got my hands on a mac IIsi. I immediatley hooked everything up and tried to boot it. it powered up, but nothing happened. So I unplugged it and took the case off, and discovered rust on the motherboard, but I don't think the rust originated there. The case the power supply stuff is in had a rusty spot, and the motherboard directly under it has some rust on it. I am going to try to clean it, and I am hoping the whole thing isn't already fried. Recommendations?