Hello, I was given an old imac, G3, 400mHz, slot loading, M-5521. It presently has OS 8.6 (I plan on udgrading OS). I have never operated a mac and am curious as to what a couple of my good friends rave about, so I am trying to get the machine operating. I did get it to power up and everything seems OK except for the brightness and contrast level. They are extremely low and the picture is difficult to see. I went to the contrast and brightness settings and both are set to max. Do you have any idea what may be the cause. Is it the power supply or battery??? Any suggestions or help would be appreciated.

Thanks Jim