I updated my iphone 4 to iOS 7 and it turns on and off?

Last night I was updating my iphone 4 to the iOS 7 I had it connected to Wi-Fi and charger it went through it started restarting it only showed the apple when you turn it on and the loading thing then it got stuck and it turned off after it tries turning on but then it turns off and it continues doing the same thing so now my phone turns off showing the apple then it turns off.

Battery trouble i think

  • My itunes says it hasn't updated een though I updated it? I went to update my iphone and it said I had to update my itunes first and restart my computer (i have a macbook.) So I did all that and went to try and update my phone again and it still said I had to update my itunes first so I did it again and it is still not allowing me to update my iphone. It still says I need the latest version of itunes. What am I do wrong!
  • My iPhone turns itself on and off randomly? My iPhone 3GS has just started turning its self off and on like 20minutes ago and it's got 57% of battery left, I don't know what's wrong? And I don't wanna go to the apple shop because I don't want my mum to have to pay for a new one because we have a tight budget. And if I tell her she will go mad!
  • My iPhone keeps turning on and off like it turns on and off. Can someone tell me? Okay tbms it turns on and off on and off and then sometimes it shows a red screen for a few seconds then off again and dies out. It's not the battery because I got that changed thinking that it was the cause and it wasn't. So is there anything someone can help me with? The repair guy tried restoring it through iTunes he said it didn't work either it just won't come on it doesn't go pass the Apple logo before shutting off and on again and dying out
  • My iPhone 6 Plus repeatedly turns on and off since I updated it to IOS11.1? I've tried resetting it different ways, I've removed everything from the phone and started a fresh but it just keeps doing it. Has this happened to anyone before?