Did you accidentially unplug the front panel connectors?
Is the 24 pin power cable completely in the socket?
Are the cables on the other end (in the psu) connected?
Maybe spend a bit less on the case and get a more powerful processor ;)
You should also be fine with a 500w or 550w psu, save some extra there. Don't cheap out on the psu, but 600w is just a bit too much.