Please help: iMAC doesn't recognize TC.  Amber light flashes continuously

This is my second day trying to install Time Capsule. Some background: I have an Arris brand Comcast cable modem. Internet service is fine when I connect the modem directly to the iMac, but not when I run it through Time Capsule. Air Port utility scan comes back saying it can't locate a wireless device. I've double and triple checked all cable and power connections. In addiion I've installed and reinstalled the Time Capsule software, with no effect. I also followed the following steps:
1. Unplugged the power cable from the TC
2. Unplugged the cable modem and hit the reset button
3. Waited more than 2 minutes
4. Connected ethernet cable to modem; and to iMac
5. Restored poser to modem
5. Restored power to TC
Still no effect: iMac doesn' recognize TC
I also bypassed the modem and directly connected the iMac to the TC. Light continues to flash amber. I also turned on Time Machine from the dock. Predictably, I got an error message that the storage device oouldn't be found.
What else can I try? Should I reset the Time Capsule, or will this just foul things up even more? Thanks.

you need to call your ISP and have them release the DHCP lease on the mac address of your PC and allow the mac address of your TC to join the nestwork.
You PC 's mac address currently has the DHCP lease.

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