so i got a G3 power mac from a yard sale. my girlfriend actually bought it for me, for $25. she said that they told her that it worked, but i can't get it to. the power comes on, and i can eject the cd tray, but that's about it. it's got RAM, hard drive, video card in there, but i get nothing displayed on the monitor, and when i plug up the keyboard (usb), it doesn't seem to work with it either. any ideas?