How to reset iPhone to factory settings from computer if screen doesn't work? I dropped the phone and the screen is not responding. 
Before I take it to get it fixed I want to restore the iPhone to factory settings because I'm logged in on my apps, and I don't want the person fixing the phone to get access to my Facebook and other accounts. 
I tried to turn it on again but the screen is not responding. 

How can I reset my iPhone from computer if the screen doesn't work?
Indeed, placing the iPhone into recovery mode, then connecting to iTunes and restoring will do the trick. Here's an Apple-provided article on how to place the iPhone in recovery mode: http://support.apple.com/kb/ht1808

Make sure you use the official Apple to USB lightning connector when attempting this recovery process. I tried several non-apple cables and I was unable to follow the recovery process and generated errors in the recovery process. As soon as i used an official Apple cable - no issue.