Linksys router wrt54g works with pc laptop but not mac desktop

i have a linksys router wrt54g. using my pc laptop i configured the router with a wep password. my pc laptop asked for the wep once and has no problems connecting everytime i turn it on. my older(powermac2,1) desktop (mac os x) asked for a wep password i entered one of the four given me by the router and it worked. on later attempts to access the router i have been unsucessful. i am asked for a wep password and when i enter it i am told the password is not correct. when i reset the router, airport has no problem connecting but i have no security. also i can't access the router online like i can with the pc laptop.
can anyone help???
Mac OS X (10.4.8)

try a "$" before your password

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Linksys router wrt54g works with pc laptop but not mac desktop

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