Installing Airport Extreme 802.11n card in eMac killed keyboard?

Hello,
I got an Airport Extreme 802.11n base station and card for my eMac (which I want to run in the next room from my new Mac Pro) from local Apple Store yesterday.
I read and followed the card installation instructions exactly. - This included installing the software from the CD.* - But as soon as I installed the card, my mouse and keyboard lost contact with the eMac. (Totally unresponsive to key commands or mouse movement.)
I shut down my eMac and my (new) Philips DSL modem: both of these have shown no symptoms up to the time of the card installation. I un-installed the card and waited 5-minutes. Modem and eMac came back normally and so did my keyboard and mouse.
Just prior to installation, I ran DiskWarrior and Repair Permissions. Also: I unplugged and "re-plugged" the USB keyboard and mouse before shutting down of eMac & modem - this made no difference.
* I did notice: The documentation for the base station says the eMac needs Airport Setup Assistant 5.2. The eMac has Airport Setup Assistant 4.2. Yet - when I ran the installation program, it recognized and reported as updated Airport Setup Assistant 4.2.
Anyone have a solution to my loss of keyboard and mouse with card installed? Please - the Mac Pro arrives tomorrow.
Message was edited by: macnoel

I'm answering my own question:
I got around to simply trying a second time to install the Airport Extreme card in this eMac. This time - I shut it down before starting installation of the card.
I suspected that shutting down would be a good idea - since it seems very likely that the System needs to load whatever drivers or extensions are needed to enable Airport. But the instruction either did not mention shutting down before installing the card or I missed mention of it in my haste to complete this and numerous other tasks before day's end.
Anyway - that seems to be what happened because bootup was normal and the mouse cursor and keyboard worked as soon as the desktop appeared.
Now - I proceed to setup the base station and test it on the eMac. If all goes as I hope - in 36 hours I'll have both this old eMac and the new Mac Pro living happily in their separate rooms.

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