Hi,
You may want to press and hold (using a pen or a paper clip) the reset button of the router for 30 seconds and then unplug the power of the router. Turn off the modem, wait for 10 seconds, turn on the modem, and then the router, and make sure that the modem is connected to the internet port of the router and PC to the ethernet port (1, 2, 3 or 4). See if the router will obtain an IP address from the modem. If not, download here
http://www.linksysbycisco.com/US/en/support/WRT54G2/download the latest firmware for the router.
Ensure that you download the correct version for the router.
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