I picked up a grape iMac G3 at a yard sale today. When it starts up it goes to an OS X installer. Each step takes a long time, and I don't have the OS X disks. What should I do? I have OS 8.1 on a disc, but that might be a little too old for this computer. TIA. Edited to add: After it had been on an hour or so, it was quite warm, especially near the carrying handle on top.