How far down is it pulled?
Say it was 2 or 3V instead of 5. Then you can feel the chips looking for an abnormally hot one.
If it is right down at 0V then the fault is a dead short. The offending part won't get hot because power is voltage times current, and the voltage is 0. In this case you can use a 4-wire ohmmeter or other kind of circuit tracer to track it down. Or you can try the ghetto method, use a high current 5V supply to blow the faulty part up completely.