Question about torch, please help?

HELP I cannot get my propane torch lit. I have a self igniting torch&usually just turn up the gas and press the starter on and it fires right up.I am having a hard time now.tried a lighter thinking it could be the igniter in my torch head no luck. My step dad has tried it a few things, tried taking the canister off the head and putting it back on. We have adjusted the oxygen intake, any suggestions?