The 1.1M ohm 5V-Gnd resistance is a problem. That most likely means one of five pins of the LM2596 switching regulator is not connected. You can take a look at those five pins under good lighting condition to see if any of them seems to be disconnected from the PCB pad. You can try to apply some solder to reinforce the connection if that’s the case. At any rate, this is an unusual case as all OSPi boards are fully tested. Again, if the problem cannot be solved, you can contact OpenLab for a replacement. Alternatively we can send you a replacement board directly, which will take 2-3 weeks to arrive.