Reset my jailbroken iPhone 4 and it's stuck on the circle loading screen

Okay, so my power button is broken so I can't hold the Home & Power button at the same time to fix it. Also, none of my USB charger lines work for my iPhone so I can't connect it to iTunes and force reset it. Please help me, I don't know what to do. IIm thinking of leaving it overnight without charging it so it could die. I was charging it all day with my wall plug line. It's the only charger that works for it.

Added (1). Reset my jailbroken iPhone 4 and it's stuck on the circle loading screen.

If your home buttons broken and you can't plug it in, I'm sorry to say you're out of luck. Don't reset a jailbroken phone from settings, only from iTunes. IPhone charging cables are fairly cheap, so I'd buy another one.