New to macs, can I have some help?

Hey everyone, first post here and first mac. I picked up a powermac g5 with dual 1.8 [COLOR=blue ! important][COLOR=blue ! important]processors[/COLOR][/COLOR] for $80 with no hard drive. I ordered a western digital 500gb 7200rpm sata drive. Got that today, I just installed the hd, and the computer won't power on. Press the button and it lights up for 1 sec, fan jumps but doesnt spin, gives out 1 click of a noise and turns off.

When installing the hd, i didnt have the oem drive to use the brackets from, so its just sitting in the bottom bay with the wires hooked up. Any help here would be awesome, I'd love to use my mac!

Is the power cord from the back of the machine to the wall mac specific? The one that came with it is just a no name.


Battery reads 3.6v on a voltmeter, I checked ram and it is seated properly.