I assume you're using the Wood kernel, in which case, you need to turn off soft reset and cheats.
Tell me what cart you're using, and I'll do my best to help you out. If you happen to be using Wood (since carts running the Wood kernel are the only ones that seem to have this issue), shut off soft reset and cheats.
By the way, for everybody, if you have cart issues, don't just post that it isn't working for you: tell us your cart, kernel, and exact problem. Chances are, I have a few solutions for you to try out.