Doug's right. I'm not being a smartass Sheila, but try to find someone who either sells the brand you have or is an independent with no ax to grind (ie, sell you a new one). It could be one where replacing/adjusting the heads is NOT possible and you'll end up buying another anyway. My best advice is 1) Don't try to fix it your self. 2) Tell the repairman exactly what you said here and don't try to diagnose it for them.

Good luck.

Spaw