Is their a reset button on the time capsule or am I out of luck.
Yes I have turned on and off etc. the cable modem has been tested and is functioning ... Do jthese units go bad.
These are two different devices?
You have a yellow light on both of them?
However, yes, you can reset either one of them.
A yellow light could mean there is just an update for each one of them.
But if yours isn't working there is another problem.
See this Apple doc about the blinking yellow light:
Retrieving data ...