Why won't my apps on my iPhone 4 open/launch?

I brought a new iPhone 4 a few days back.
Apparently, this problem started today.
When I press on an app, the screen turns pitch-black for a second and then it goes back to the home screen.
This problem is only with the apps I downloaded from the App Store, but the apps that were already installed in my iPhone 4 still work.
I tried:
● Turning off my iPhone many times (using the red slider when you hold the button)
● Downloading a new app from the App Store
● Deleting some apps
● Closing all of the running apps in the background
● Charging the iPhone to full battery
● Reset all the settings (not everything on the iPhone, just the settings)
Please help me!
-MysticalCrystal

It sounds like a software glitch - backup your phone (through icloud or itunes or both)
and restore your phone as a new iphone by going to settings-> general-> reset all settings
see if it works now -> if it does you can try restoring from backup and see if happens again-> if it does something is corrupt in the backup and you need to keep it as a new iphone
if it does not-> take to apple store but the restore should fix it

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