Macbook can no longer detect HP 2540

The same computer and printer were working fine (routing through an Apple Airport Extreme). I recently reset my password on the airport, and the printer couldn't reconnect. I reset the printer (pushing two buttons simultaneously) and now I get nothing.
I was able to connect directly to the printer (bypassing the router) using HP setup, but now that option has disappeared from my wifi picklist (I only have one HP link, and that's asking for a password).
I have HP printer utility installed, but that is unable to detect the printer either.
Any ideas?
Thanks in advance...

OK.... the is really baffling me...
Here's my setup:
Airport Extreme - constant PPPoe connection to ISP - running 80211n only
iMac conneting to Airport Extreme via ethernet
Macbook connecting to Airport Extreme via 80211n
Airport Express connected to Extreme via ethernet
Macbook Pro and Powerbook and 2nd Express (relay) connecting to Express via 80211g
iMac also connects to Airport Express via 80211g (in addition to direct ethernet connection)
So.... here's the problems....
Macbook and iMac cannot speak to each other. Macbook can see iMac's itunes but gets an error when tyring to connect (unspecified error - make sure port 3689 is open)
Cannot do a 'connect to server' either way between macbook and iMac.
iMac can see and connect to both Powerbook and Macbook Pro. It can also see itunes library on both of thses and vice versa.
HELP!!!

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