G5 dual 2.7 powers on but no boot chime, video, keyboard activity

Hello:
I have a Power Mac G5 dual 2.7 from late 2005 w/ 2 GB RAM and no hard drive. Clearly, I won't be able to boot without a system. I bought it without the hard drive, thinking I'd install my own but test with a universal Tiger disk first.
The problem I have is that after I turn the power on, the fans go and the manufacturing LEDs (the two red LEDs indicating that the plastic cover is off and that the optical inputs are present) go on, but nothing else. The keyboard shows no activity, and I can't open the DVD-RW with the open button. No video comes up. I've tried resetting the PMU. The fans start slow, but rev up after a cople of minutes. The logic board shows no diagnostic LED activity, and other than white when I press on or off the power button, no activity from the LED above the power button. I tried reseating the video card and using a new PRAM battery.
Can anyone help me with this?
Thanks!
Thanks! MZ

I can't open the DVD-RW with the open button.
Either try holding the Mouse button down while powering on, or slide the door down and use a paper clip in the tiny hole there to force open it.
Did you replace plastic cover & close it up?

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