My iPhone 4 will not turn on. Is there a reset?

[iMore Question]

I shut my phone off because it froze up now it will not turn back on - is there a reset?

 

[Just_Me_D]

Plug your iPhone into a wall socket and let it charge uninterrupted for about an hour. Afterwards, press both the power and home buttons simultaneously until you see the  logo. After seeing the logo, release both buttons and let your iPhone boot to the lock screen.