Hello, all. I recently came into possession of a 2005 20" iMac G5 with a bad motherboard. While searching for the motherboard online, I noticed that some of the 17" motherboards have the same part number (820-1540-A). Will this motherboard from a 17" work in my 20"? I searched on here, but was unable to find an answer to this question. I would greatly appreciate anyone's assistance with this matter.