Can't connect WRT54GL router to Motorola Surfboard cable modem SB6120

I can't connect my router (WRT54GL) to my new cable modem (Motorola Surfboard SB6120).
Some info:
1)  Cable modem works perfectly when connected directly to computer ethernet port
2)  ISP is Optimum Online
3)  Using Automatic DHCP setting on router
4)  Using MAC cloning on router
5)  I can access the router's admin screen from the PC
6)  I can connect to the router wirelessly, but no internet access
7)  I've tried powering down everything multiple times, still no internet access
8)  I upgraded the router firmware to 4.30.14
9)  The "link" light on the cable modem never lights up when connected to the router
10)  This is very frustrating
Thanks

Dabug wrote:
Hi
I've tried two ethernet cables, no luck.  On the router, I get lights for Power, WLAN and the ethernet port that the pc is connected to.  The "internet" light is not lit.
When the modem is connected directly to pc the link is lit up, just not when it's connected to router.
The internet light won't turn on as you need to plug something on the WAN port. And that should be the cable coming from the modem.
When you connected your pc directly to the modem, do you get internet access?

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