Problem installing RAM (flashing power light, etc.)

Hi everyone.
I have been spending the last 2 hours trying to install this OCX Ram (2x1GB) into my PowerMac G5 Dual 2.5. Before installation, I just had the 2x512 Apple memory.
After installing the RAM following instructions from Apple's website, I turned on the computer and the power light just flashes twice, pauses, flashes twice, pauses, etc. I read that this could mean either the RAM is bad or installed incorrectly. I tried repositioning the ram in several different slots, but to no avail. Below is the link to the RAM from the site I bought it from. It seems like it would be compatible to me (A user review claiming to have used this model in his/her 1.8 1st Gen G5 claims it works fine).
To make matters worse, I took the new RAM and out and put the original RAM in their original positions and I still get the double blinking light! Can someone please help!
http://www.newegg.com/Product/Product.asp?Item=N82E16820146970
Dual 2.5, 1GB (2x512) RAM   Mac OS X (10.4)  

1GB, 184-pin DIMM, DDR PC3200 memory module CT392184
US $114.99
* Module Size: 1GB
* Package: 184-pin DIMM
* Feature: DDR PC3200
* Specs: DDR PC3200
• CL=3 • UNBUFFERED
• NON-ECC • DDR400
• 2.6V • 128Meg x 64
Crucial - PM G5 2.5
When I searched, I came up with Newegg Patriot Memory $228, same price as Crucial. If you want to exchange.
The memory you have has heat spreaders, which you shouldn't need, not that it is causing problem.
It isn't Mac compatible, lacks SPD the Mac needs usually.
You need to reset-nvram when changing hardware configuration usually. Manufacturing changes so even Crucial sometimes runs into problems with compatibility. Where two batches don't work together.
If you have a G5 2.5DP, memory based on someone else's system, with slower fsb and different specs?
Mac Pro 2GHz 4GB 10K Raptor 23" Cinema   Mac OS X (10.4.8)   WD RE16 RAID DW 4.0 APC RS1500 Vista RC1

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