So many possibilities to troubleshoot... Where do I begin?

Using Arduino LEDs and Multiplexing
7

CrossRoads,

Wow thanks for all of the pointers. I've made all of the appropriate adjustments to the schematic, but I do have one additional question:

CrossRoads:
ULN2004
http://www.ti.com/lit/ds/symlink/ulq2004a.pdf
can only drive its outputs low, so:
+5 to anode, cathode to resistor, resistor to ULN2004 output.

I'm going to be using LED strips. I thought I saw current limiting resistors on the strip. If they have them on the strip would it be necessary to include them on this board?

Thanks again guys,

Loren