Not picking up ethernet connection

Hi,
I am using a WRT54GS. its and old one about 1 years old was working with my SBC Yahoo SpeedStream DSL modem well.
recently I switched to Cable. Now the CAT5 (rj45)  that comes out from the cable modem works well with my HP n6120 office laptop picks up the Ethernet connection well and I am getting the wired connection with no problem.
however WRT54GS not picking up the ethernet. internet light is just blinking. as if its pooling but not finding any network. same thing happening if I try to setup it up as a HUB or access point.
Is there any setup I can change in the router? to make it work.
I dont understand how come the wired connection working with the laptop and not with WRT54GS. this is a good working model not too much used also.

Yes I tried with the cable comes with the router and then with another one that is hand made. Wired but someone told me that the ISP is running a 24online client at their end. if true, it probably is tracking my MAC address. Even if that is true, I clone the mac address, that should hv been worked.
next why the internet light goes off and on at the router, as if its not finding any internet. where as if connected to the PC it just works good.  could there be any other wireing issue.

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