Thevenin with Variables: Finding Thev Eq for Nodes A and B and C and D

[sisyphus0321]

Homework Statement

For the circuit shown: Find the Thev Eq between nodes A and B and then for nodes C and D.
I worked the second half of the equation but am stuck on how to begin the analysis for the opposite end of the circuit. I have attatched the image as well as posting it as I am having some issues with this terminal.

Homework Equations

Voc=Isc*Rth
KVL
KCL

The Attempt at a Solution

http://http://i625.photobucket.com/albums/tt333/sisyphus0321/untitled.jpg?t=1238023439
Between C and D:
i_x+Bi_x=Voc/R_o
Voc=R_o[i_x+Bi_x]
Isc= i_x + Bi_x
Rth=R_o

 

[Kruum]

Can you make the image bigger? It's too small to be readable and gets too blurry if zoomed.

 

[sisyphus0321]

Sorry.

 

[Kruum]

I believe http://www.scribd.com/doc/454419/Class-3-Thevenins-and-Nortons-Theorem is of use in this problem. If you still have problems, I'll try to clarify things.

And the picture is readable now, thank you.