I'm not familiar with that kind of filter, I have Aqua-Techs and an Emperor 400. But Ive had that happen before with mine and what happened was the intake tube wasn't properly seated in the impeller. If a powerhead is like my kind of filters, try pushing the intake tube down to make sure that it makes contact with the impeller.
twood, I made that mistake as a newbie too! Listening to the motor almost grinding, scares the crap out of ya! Then add water and go, DOH!
55 gal with 3 fancy goldfish. 2 goldies in QT, 23 flatback hex tank with betta, 3 ADF's, 2 BN's and nerite snails, 60 gal community tank: 4 angels, rainbow shark, raphael cat, apple snails,etc.