My iPhone 4S won't turn off? - 2

My phone won't turn off. I already held the home button and power button together, but as soon as it shuts down it turns back on. I reset all settings, but it still won't work normally… I've heard that cleaning the charging port with a toothbrush might work but I'm not sure.
The sound also isn't working (for now I'm keeping t charged so it won't

Your sequence of button presses is probably incorrect.
To power down the iPhone, press the power/lock button for 3 seconds - without pressing the Home button. If I remember right, pressing the Home button along with does a reboot, so it power cycles in stead of power off.

Here's a link that may explain it better than I:
http://ipod.about.com/od/iphonehowtos/qt/turn_off_iphone.htm

Hope this helps!