With airport card inserted, Mac G4 won't start.

I just inserted an Airport Extreme Card into my PowerMac G4 (MDD+Firewire 800).
Now, when I go to start up my computer, the fans just blow really loud and it doesn't start up. Nothing on the monitor, no apple start up sound. Nothing.
I did an experiment and took out the card, and then restarted it, and it worked just fine. So I know that its the airport card.
But why would it do this?

Hi-
Did you install it correctly?
http://www.info.apple.com/usen/cip/pdf/g4fw800/g4fw800-airport-extreme.pdf

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Could be many things, we should start with this...
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Hi,
My airport card in my mac has been working fine up until the other day. Now I cannot connect to my Airport Express, or any other wireless network for that matter
At first I thought it was my Airport Express, but now im not so sure. When I boot up and turn on my Airport Card its gives me the colored pinwheel and freezes completely.
I can connect to internet via the lan port (wired) to my modem however when i try to connect via wireless it freezes.
Is my airport card faulty? is there anyway you can test it?
Why would it stop working all of a sudden? I have removed the card and reinserted it (powered down of course) and the arial is connected firmly.
I dont have another card to check it.
Help!

I am also having the EXACT same problem with one of my Macs.
I have a PowerMac Quicksilver 867mhz G4 and a 12" PowerBook G4. About a year ago my PowerMac froze with the color wheel spinning. I had a lot of graphics programs open at the time and I figured I was trying to do too much...so I restarted. When I rebooted the computer would freeze as soon as it got through the start up screen. Through the troubleshooting process I tried unplugging the airport card in my PowerMac and it started like a charm.
I can’t figure out for the life of me what’s wrong. With the airport card plugged in, the computer freezes and will eventually (after 10-20min) stop trying to find a signal on the airport and finish the start-up process. When I use the pull down menu from the icon from the icon in the menu bar, it doesn’t find my base station or any of my neighbors. My laptop on the other hand finds my base station and 3 of my neighbors’ - full strength. My work laptop (a PC) finds my base station as well and has no problems connecting.
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Right now I am running the internet over airport to my poor ol’ PowerBook with internet sharing enabled and then running that connection through the ethernet cable to my PowerMac. Talk about a crazy contraption, but it works.
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Message was edited by: Mr Dobalina

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Dear Ronda
Thank you. Seems not that this is the problem.
Found that in the Airport Forum - others do face the same problems - no solution yet:
D-Link Wireless Access point. PC works great..Mac is SLOW on internet.
Posted: Apr 5, 2006 8:16 PM Reply Email
This has really got me frustrated. I own a hotel and am working to get it set up with a wireless internet connection. I've got a qwest dsl modem going into a D-Link router, and then today added another D-Link access point (actually, the computer tech added the new access point). I needed this additional access point because there were too many dead spots in the hotel with only one D-link.
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With airport card inserted, Mac G4 won't start.

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