Your labmate had his headphones in and was jamming out to Roar, one of Katy Perry's hits, so he wasn't really paying attention when he set up his...

Your labmate had his headphones in and was jamming out to Roar, one of Katy Perry's hits, so he wasn't really paying attention when he set up his electrophoresis gel. You walked into the room just as he turned on the power button. What's wrong with the setup he used? What will happen if the gel is allowed to run? Why? (Hint: You only have about 2 minutes to correct his mistake before it's too late and he'll have to start all over again).