1900 ldg gear stuck?

HiI was flying a hop with the 1900 into KPHL ILS app with ATC. After recieving vectors I set up the approach as usual. At the outer marker I selected the gear handle to lower gear. There was no noise and the gear didn't cycle? I went missed and checked switches etc... I turned on the deice (it was freezing) and couldn't get the gear to extend? No green lights, and I double checked the external view. So I did the belly landing rebooted the FS9 game & all was well. Just wondering if this happened to anyone & why? I had no failures selected.Aloha Will