Hi, I am building a Hard drive activity meter based on the schematic at https://www.gideontech.com/guides/HD_VU/index03.shtml and I am having some troubles. I am pretty sure I have built the circuit correctly, and am testing it. The directions say to short pins 4&5 on the optoisolator socket, which I did, and then put 5V over the input. I attach the power, and the first 5 leds light up, without the last 5. Ideas?