Warnings about power supply in EAGLE
On the schematic, make grab each device and drag it a little to make sure all pins are actually connected. That should help you find things like IC1P V+ connected to N$2 vs being connected to 5V.

Check the board layouts, make sure the pins you think are connected to 5V are actually connected to 5V.  I change the Unrouted layer to something more easily seen - like Yellow when the Top &amp; Bottom layers are turned on, or Black when they are not - to see them more easily.  Run the Rats Nest to make sure there are no airwires.  If all the pins are connected as you want, then you can Approve or Ignore the warnings.

I add a Ground layer to both top &amp; bottom. Draw a Polygon around the outside of your board, and Name it Gnd, for both layers. May have to tweak the end point of the polygon a little to not have it overlap itself. Do not route Gnd signals - let them connect to the Gnd plane. Maybe just add a short section of Gnd trace to an SMD pad if it is a thin pad and will connect automatically.  Add Vias Named Gnd to connect the top &amp; bottom layers.  Companies like iteadstudio.com will accept vias as small as 12mil to connect the layers.  I may go that small near an SMD pin to connect it to Gnd on the bottom layer. Then use 20 mil or 24 mil vias to connect the layers. Rats Nest will make the layers show up. You can use the Rip Up button to make them hidden again.