Also, when reassembling ensure the metallic tab/tape connecting the hard drive ribbon to the blue mounting bracket. As seen in step 9 is still on top of the mounting bracket.
When I reassembled mine the tab became folded down and was touching pins connecting the drive. As a result the iPod worked as a player but had difficulty charging, would not connect to iTunes or show as a mounted drive. After waiting along time it would be detected but would not work with iTunes. iTunes would report the iPod as corrupted or in recovery mode. Removing the tab/tape from the pins restored function.