IndustrialCraft machines not receiving power

I have a nuclear reactor hooked up to an MFSU, which then goes through MV and LV transformers to reach machines like compressors and macerators. It all worked fine up until I placed a mass fabricator on the output wire of the MFSU. Suddenly, all my machines stopped getting power, even when I removed the mass fabricator. I checked all the connections, but it should all be working fine. My quarry (which is connected to the HV output of the MFSU) is still getting power and working normally. I have roughly 5000000 EU in the MFSU, and even if I switch on my nuke it still does not power the machines. How do I fix this problem?

After starting a brand new world, a total fluke left me with the solution. In my new world, I had placed a lever next to a redstone engine, but on top of an LV transformer. As it turns out, when you apply a redstone current to a transformer, it prevents the flow of electricity. Sure enough, when I loaded my old world, I found a lever on a centrifuge extractor (which was on top of the LV transformer) and was therefore preventing the flow of electricity.