Wireless Works, Ethernet Does Not Work WRTP54G

My WRTP54G works great via wireless, but the ethernet does not connect to either my Mac (10.5.3) or my Windows XP machine. The Mac is the primary computer connected to our home network and is right next to the router, so it seems dumb to have to connect the Mac and the router via wireless. I am hoping for a faster connection for the Mac to the internet via ethernet
The WRTP54G has firmware version 1.00.62 loaded on it, although I am not certain how to upgrade the firmware to at least 1.00.9 (seems that any later firmware causes problems with Macs)
I noticed that the Wireless Firmware Version (Status - Wireless) is 1.6.0.24. Not sure if that matters.
I have attempted to use three different CAT5 cables between the Mac/Win and the router, so I believe bad cabling is ruled out. My Win machine's ethernet works perfect at work, so I believe ethernet hardware on both can be ruled out.
I have tried to reset the router to factory default -- no dice. Any thoughts, anybody?

As a follow-up to provide additional symptoms:
I also have an XBox 360 and a Mac Book connected wireless. I have not attempted to connect those devices via ethernet.
I also have Vonage; there is no disruption in service there -- that wired connection seems to be working fine.
I am also experiencing that each device connected via wireless, except the Win XP machine, will randomly lose wireless connectivity. The SSID broadcast is disabled and I have not enabled WEP. Not sure if that matters. Client lease time is set to 9999, not the default 0 for one day.
When I plug the Mac or the Win machine to the router's ethernet ports (any one of the four), the router's ethernet lights do not light up. Is it possible the ethernet components are fried?
I purchased the router two years ago when I enabled the Vonage service.
Thanks to anyone who can help.

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Wireless Works, Ethernet Does Not Work WRTP54G

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