My 2.16 (2006) 24" iMac seems to have a problem. The white light on the bottom right hand side stays on when the computer is turned on. Screen is black. No sound during start up. Fans spool up. I think I hear the hard drive. From the research I've done it's the logic board. It's obviously not under warranty. I don't plan on spending $100 for a diagnostic which leads me to the same conclusion. Quick question - is it possible that my internal battery has died and could lead to this problem? I plan on resetting my PRAM once I get a wired keyboard but I'm very doubtful that will do anything if the board is dead. If you have any suggestions or thoughts on a solution let me know. Logic boards for a 2.16 easily run for $350-550 on Ebay.