You didn't answer m question. Does it say "Connecting" or "Disconected"? Those are the 2 statuses that disable the Search button.

Go to the Options. Is LW configured to connect on start-up?
Also, do you have any firewalls?
Post some info on your computer configuration (read the rules to get an idea on what to post)

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-