Only 10 seconds of Internet connectivity on Intel based iMac

My iMac of 2007 is having trouble connecting to the Internet.
The setup is pretty straight forward. The iMac is connected through ethernet to a motorola cable modem. The provider is Ziggo. I live in The Netherlands.
Two PC's, a desktop and a laptop work fine and keep working when plugging in the ethernet cable.
Plug the ethernet cable in the iMac and everything works fine too -- Only for 10 seconds! Then internet connectivity is lost, while the ethernet status remains "connected" and even the IP address is still there.
A "Renew DCHP Lease" gives me another 10 seconds of Internet connectivity, after that same problem.
I changed cables, just to be sure. Even though the PC's are working fine with the original cable.
I've reset the modem a 100 times already.
Any suggestion would be greatly appreciated!

Solution was simple, just leave all PC's turned off for a day. The modem "forgets" the MAC addresses and all works fine.

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