Machine thinks RAM is incompatible (two beeps, loud fan, no video)

The Problem: computer will not boot, gives two beeps and fans run full blast. The status codes indicate not that the ram is bad, but that it is not compatible with my machine.
Background: My PowerMac G5 1.8 Single (Late 2004) has been collecting dust for the past two years, so I decided to make use of it and turn it into a media hub. I basically dismantled it and dusted all the parts (I know what I'm doing for the most part) and put it all back together. I wiped the hard drive before doing this so there is no OS installed.
Now when I turn on the computer, I hear two beeps, the fans go full blast, and no video. The power button LED blinks twice, pauses, then repeats until I turn off the computer. I am using the same RAM, so I know it is compatible.
I have tried resetting the SMU, taking the RAM out and replacing it, installing the ram it in every possible configuration (2 512 mb sticks and 4 slots), and ensured that it is in correctly. I can't install OS X because I cannot get picture, nor does the optical drive open.
The blinking power light indicates there is a problem with the ram, but my experience (experience of only upgrading RAM and NEVER needing to replace it) makes me want to look for other causes before I order some new RAM. I tried resetting the SMU, but I'm not convinced that it worked, especially since my model doesn't appear to have SMU or PMU reset buttons. Apple says to turn off the computer and unplug the power cord for two minutes instead.
I should also add that none of the status lights around the memory slots are lit up, but there is a solid red light coming from the top corner of the motherboard just above the expansion slots. I have yet to discover if this means anything.
Any suggestions would be greeaattly appreciated
Thanks,
Jack

Are you positive you've installed the two RAM sticks in the innermost slots of each bank of slots as shown in this article: http://support.apple.com/kb/HT2248

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