Iphone password changed by itself & other problems?

My Iphone 4 password changed by itself and I don't know how. I have had the same password for months and all of the sudden it has changed. I tried connecting my phone to itunes on my laptop to reset it and it keeps saying error. Now, my phone only comes up with the charger sign with itunes above it and won't go. I've tried turning it on and off but it just turns up again.

Go to the Apple Store and they might fix it (it depends if it still has warranty) but you should call them first

Google it

Dang John your a savage