Revvy has a much longer post that may make it here soon, but in general:
Just give it more time. As long as you used the right amount of sugar, it will carbonate given enough time. Some beers take 3 weeks, some take 3 months...just be patient!
Originally Posted by SittingDuck
Even ales take too long. I need something I can ferment during the boil and drink from the kettle!
You have to grow old, you don't have to grow up.