Internet signal stops at router

I have a wrt54g v8 router. Worked fine until one morning I booted up my computer and there was no internet service. Provider troubleshot to a bad router. I bypass the router and internet service returns.

On the router I have all the necessary lights lit. All online help is useless due to no internet service when on-line help has me connect the Ethernet cable back to the router and router to the computer.

In short the signal seems to stop in the router.

please help