Macbook Airport doesn't work on AC power

Yeah, that's basically the deal. My airport decides that when it's connected to the charger, it randomly drops out (ie the signal thing greys out). If I click back on it, the network has disappeared and I can't get back on unless I unplug the charger from the macbook and restart.
it seems to be opposite of the problem that everyone else is having.
any ideas?
I have 10.4.11 with a WRT54G. Definitely not a signal issue, full bars on all PCs and the macbook when it connects.

My wireless is password protected and when I type in the password it says "connection timed out"

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