Power Mac G5 Refuses to start with new RAM!

I have a Power Mac G5 Dual 1.8GHz June 2004. I know I read somewhere online that it takes 1GB sticks of RAM, and that it has to be dual channel. I went to Best Buy today and got myself 2 sticks of 1GB DDR PC3200 "Compatible with 400/333/266MHz" Dimms, and installed them in pairs. When I start them with or without my old memory, my mac starts up, makes no noises, but the fromt white LED light blinks 2 times, and does this repeadedly until I shutdown and install the old 512MB sticks. I need to get this new RAM to work in here, I just paid $112 total for 2 sticks, and I am not ready to go back to the store yet. Is there something I am missing here? Something I am not doing right?
New RAM Specs:
1GB DDR Dimm,Q PNY Technologies, PC3200 "Compatible with 400/333/266MHz"
I need to get this to work on my machine! Thanks for any help.

Is there something I am missing here?
Not all RAM is created equal and seldom does over the counter PC RAM work in a G5.
Buy and install ONLY guaranteed Mac compatible RAM.
http://eshop.macsales.com/shop/memory/PowerMac-G5-Memory
BTW, you paid too much.
When I start them with or without my old memory, my mac starts up, makes no noises, but the fromt white LED light blinks 2 times,
That means "Incompatible RAM types".
http://support.apple.com/kb/ht1547
I am not ready to go back to the store yet.
Go back to the store.

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