laptop won't switch on after installing airport card

I bought an airport card last week for my g3 ibook - an 802.11b.

Inserted card - didn't work.

laptop now refuses to switch on and boot up.

have tried all sorts of things -taking battery out, using different keys. A previous post I found suggested that the wire that attaches to the card could have shorted out the computer. I still can't find a solution to this, despite scouring the internet.

So, to summarise -

I can't boot it up at all.

Any suggestions gratefully received.

Keyboard appears to have some power in that the caps lock key will switch on - ie register as green, even though the actual computer won't switch on or boot up.

Thank you.