Internet suddenly stopped working on WRT54G for no apparent reason. Any ideas??

I have a WRT54G v2 that has been working fine until a couple days ago the internet stopped responding.  Internet works fine with direct connection from modem so that isn't the problem.  Internet light on front of router is solid green when internet is plugged into it but computers can't access internet wirelessly or through ethernet connected to router.  All other lights seem to be functioning properly too.  I can ping 192.168.1.1 and can still access the web setup page.  I have flashed most recent firmware and done hard reset several times.  I've tried dhcp and tried setting up a static IP; neither makes a difference. 
I'm beginning to wonder if this is a hardware issue and the internet port on the router has somehow broken. 
Has anyone experienced anything like this?  Any ideas/help is appreciated.

I am having a similar problem with my wrt-54g ver 8 (firmware 8.00.5.002).  i lose internet connection through the router every couple of hours.  direct connections to modem work fine.  i have a switch connected to the router to provide a connection through cat5 in other parts of the house (which are connected to the switch).  the only fix is to unplug the router and restart.  once i do that every computer will work.  i have called tech support at least 8 times.  they sent me a replacement router (same model and firmware) and I'm having the same problems with this one.  they have taken me through numerous resets, reconfigs, including remote access help to address this and the problem continues to occur.  anyone have any suggestions?  my ISP is Cablevision,  Long Island NY. 
I have one computer directly to the router.  two others through the switch and a printer through the switch.  all are dell machines using XP except for one which is a Vista machiine. 
any suggestions would be helpful. this is incredibly annoying and tech support so far has been unable to isolate the problem or fix it. 

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