Non-booting Mac mini (stuck at gray screen with no Apple logo or others)

We've got a G4 Mac mini whose motherboard was recently replaced. I've put it back together carefully following the instructions on pbfixit.com, but I can't get it to boot.
When powered on, the chime sounds normal, and the screen comes on after a few seconds with a gray background--no Apple log, no spinner, no error, no flashing icons, nothing.
I've already zapped the PRAM 3 times using OptCmd+PR, no go.
I'm able to get into OpenFirmware using OptCmd+OF and have done reset-nvram and reset-all, restarting the machine, but no luck. The system date remains current also, indicating perhaps it's not resetting the PRAM either way somehow.
The disc drive won't accept a boot CD or DVD as if it's unpowered, but it's snugly connected.
I'm unsure what to test next. Suggestions? Thanks.

Greetings,
I just had the exact same problem with a Mini. Would only boot to a gray screen no matter what I did. Booting into the OpenFirmware did help, booting into the Startup utility (by holding "T" down at startup showed no hard drive and no CD/DVD drive.
Hold on to your hat . . . .
The issue was the battery. These guys have a Lithium battery that allows them to boot up, a battery that can be purchased anywhere that sells those kinds of thing. I bought 2 for $3.50, it was more time and trouble to get into the case and get at the logic board but once the battery was replaced everything works like a dream.
Here is an excellent step-by-step tutorial about getting into the case http://www.sterpin.net/uk/ddMacMiniuk.htm. Just make sure that doing so doesn't void any warranties.
Good Luck!
Gail

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    Step 1
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