Replaced PRAM battery, now G$ Quicksilver won't power up

I replaced the pram battery. Now my G4 Quicksilver will not power up. The light is on in front of the computer, as well as on the front of the monitor. However, pressing, pressing and holding for many seconds does nothing. No sounds--nada.
I bought an iMac, and want to use the G4 in target mode to transfer files, and then set up a wireless network. I have no clue as to where to start, since the computer is dead with its lights on.

Did you click on the blue text above?
Here it is again:
http://docs.info.apple.com/article.html?artnum=86760
Click the above blue text.
As you read the article that opened, towards the bottom, click "For Power Mac G4" to see model specific pictures.

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