PSP speaker wont play any sound

Hi, I have now updated my psp to firmware 3.71M33-3, i have no problems in the days that i have using it, but in one day, when i using an earphone, and i disconnect it to my psp, i cant hear a sound in my psp. i check if the speakers are broken or something, but i found out that it is related to my headset, that my psp thinks that i have still connected the headset while im not using it though. is it a firmware related problem?? when im using an older firmware, i having no problems, even in 3.71M33-2, hope someone can help. :(