Wii Problem Wont Sync?

I play wii sometimes, and usually it works great. But then one day i wanted to play and my wii remote wouldnt let me; it wasnt connected to the wii. i tried to sync the wii and the remote but it hasnt worked....i held the console sync on 15 seconds and pressed the wii remote's sync on and tried everything but NOTHING HAPPENED!!!!! what should i do???