TC/wifi issue since OS X Yosemite 10.10.1 update

I have a flat Airport Time Capsule 2TB and an iMac running OS X Yosemite 10.10.1.
We have wireless in the apartment and receive it through CenturyLink.
The TC and iMac are 2 years old. The Century Link 802.11n WiFi router is about three months old.
We used the TC to set up a network in the house and connect two iPhones and the iMac to it.
Everything was fine until last Yosemite update a few weeks ago (12/12/14, I think).
The problem: the TC blinks amber and does not set up our household network.
In the Airport Utility the Airport Time Capsule's status = three amber lights
+ ethernet unplugged (it's not)
+ internet connection (it's there)
+ no dns servers ("The Airport base station doesn't have any DNS server addresses and might have trouble connecting to the internet.")
The iMac still connects to the internet via the WiFi router and the network set up there.
Our iPhones intermittently connect to it.
I've tried to reset the TC and the router.
I've switched the ethernet cord.
I'm certain we don't have an internet provider problem.
For some reason, the TC will not catch the signal from the router, even though the iMac can.
I've read some fixes proposed by "LaPastenague" but we don't have any non-Apple products (except the iPhones; will these work?)to try the Yosemite run-around.
Thanks for your help, Community!
Happy New Year -
Adam

+ ethernet unplugged (it's not)
This looks like the problem.
If you have ethernet plugged into the Century router and TC wan port and there is no actual connection something is wrong.
I've switched the ethernet cord.
The one from router to TC I guess?
Is the connectivity light on.. on both the TC wan port and the router LAN port?
The TC should be in bridge mode.. with create a wireless network, is it??
Plug the ethernet into LAN port, 1, 2 or 3.. and see if the light goes on the TC starts working.
Your TC could be damaged.. or it could be setup in the wrong mode.
Tell me more if the above doesn't work.

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