i have an iphone 4 that currently has no sound. It does ring and makes the text message sound but there are no keyboards clicks or slide to unlock click or standby clicks. it also has no volume control when using youtube or ipod. i have music on it so i would use an auxilary cord to plug into my truck stereo. from reading other posts, i believe the inserting and pulling out of cord has caused the problem. What i am wanting to know if its a problem with actual board or the midframe? i have seen midframes on ebay for 35 dollars and i am able to switch out parts but dont wanna spend the money if the board has the problem. any help is appreciated.