Have you checked the fuses in the packs? They might be blown.
The next question is have you tired the console with other packs/fixtures to see if it is outputting? Also make sure that your master fader, preset fader, memory fader, and cross fade fader are at 100% as well, otherwise the lights won't turn on depending on what mode you are in. Lastly, make sure the blackout key isn't on.