BoArduino Troubleshooting

[D4RK354B3R]

I'm getting some very strange problems, after assembling my BoArduino.

When I use USB power or hook up an external power supply through the 5V pin on my BoArduino, it works almost perfectly and runs the Sketches I have programmed into the chip.

However, when I try to use a 9v battery through the DC jack (with the proper jumper position), only the green LED will turn on and the sketch does not run.

What could be the problem and how do I go about fixing this?

Thanks

[EDIT]: Additionally, I'm inconsistently receiving the following error when I try to program the BoArduino with avrdude:
avrdude: stk500_getsync(): not in sync: resp=0x00

[adafruit_support_bill]

Sounds like something wrong in the voltage regulator part of the circuit. Post nice clear photos of the front & back of the board and we'll take a look.

[D4RK354B3R]

Unfortunately I haven't been able to come across a camera that can take good pictures of the board up close.
What should I be looking for on the voltage regulator that could affect its behavior?
How do I test the voltage regulator with a multimeter?

[adafruit_support_bill]

With the USNB disconnected and the 9v plugged into the barrel jack, you should see 5v on the 5v pin.

Double-check that you have the jumper set to "ext". Examine your solder joints - they should all be smooth and shiny and flow well onto both the pin and the surrounding pad as in the diagram below. Re-flow any that look rough or 'frosted' or otherwise suspicious.

[D4RK354B3R]

Here is an album of pictures I tried taking of my BoArduino with my cellphone.
http://imgur.com/a/GXIrB
I realize that in the pictures the jumper is set to USB; I know to change the jumper position when using a battery.

[EDIT]: The voltage across the 5v pin was 2v. The battery itself was reading something like 6v... After changing the battery, it seems to work fine now. Haha, derp.

Unfortunately I am still getting the following error, inconsistently, when trying to program the BoArduino:
avrdude: stk500_getsync(): not in sync: resp=0x00

[adafruit_support_bill]

Yea, 6v at the DC jack is not enough to run the board.

Unfortunately I am still getting the following error, inconsistently, when trying to program the BoArduino:
avrdude: stk500_getsync(): not in sync: resp=0x00

Are you sure you have the right COM port selected in the Tools menu?
Also the Board Type - it should be set to Duemilanove w/328