iPod LCD not working after few tries and different items tested

Is your iPod recognized in iTunes when you plug it in? I had the same problem with mine. black screen, and iPod wasn't recognized by iTunes. I found the answer on this very website. By briefly grounding the positive terminal of the iPod battery then plugging in to a power source (after reassembly). it took a couple of minutes but mine came up and was recognized in iTunes. I still had the black screen though, it turned out to be the connection on the top of the logic board. The least little movement made the connector come loose and I had to be very careful when I set the digitizer to the iPod.