IMac cannot cannect to internet through Router

Hello,
I have an iMac G5, latest OS Tiger, Windows XP PC, Linksys WRT54Gv5 wireless broadband router, and DSL modem. The PC connects to the Linksys router, along with the DSL Modem. The iMac is connected wireless to Linksys router. I have no problems sharing documents, but the iMac will not access the internet. What is wrong?
Thanks!

See the appropriate link below for your broadband provider. Sometimes it helps to reset the router pressing in the Reset button on the back of the router for at least 30 seconds while the router is powered on and starting the configuration from scratch.
Setting up a Linksys router for DSL Internet connection
Setting up a Linksys router with Cable Internet service
If using AT&T DSL, depending on the modem used there may be a conflict between the AT&T DSL modem an the Linksys router. This occurs if the modem tries to hand out the IP address 192.168.1.1 to the router's WAN/Internet port. If this is the case, log into the administration page of the Linksys router and change the Local IP Address from 192.168.1.1 to 192.168.2.1, save the settings, then power cycle both the router and any clients connected to the router.

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