I just got an ati 9800 radeon 256 mb agp video card to install in my dual processor g5 1.8ghz power mac. Problem is there is a power cable with the card but I can't find the proper place to plug it in. I am new to mac but have been repairing pc's for years and am familiar with all upgrades to them. Is there a site for macs that show the way around the inside of the unit. I have already installed a second hard drive and upgraded the ram to 4ghz but don't know how to remove the cpu's to get at the power supply. Any help would be appreciated.