Finished Soldering Prototype LEDs

The good news: I finished soldering up the PIC flasher kit. The bad news: Nothing blinks. I have absolutely no idea what's wrong. More than likely I have one or more bad solder points. I've tried powering the thing with a single 9v battery and also four D cells in series, no luck. Very discouraging, and right now it looks like six hours and twenty bucks down the drain. (I know, the picture below shows two empty IC sockets, but they have since been populated correctly.)