Chosen Solution

‘‘‘Hi, this is my first quistion here :) I accidantally droped my iphone 3g very hard and the screen poped out a littile bit from the upper side and I pushed it back wile the device was still runing. I used the device for 15 minutes (it is runing normally) then I pluged the cable to charge the iphone, after 10 minutes the iphone started rebooting by it self again and again and again (it shows the apple logo for 5 minutes then it restarts) like forever. I tryd to put it in DFU mode and restore it, after the restore is complete it starts rebooting again. can anyone please tell me if its a hardware or software problem and how to fix it!! ? best regards :) ’’’

Open phone following guide for rear panel. Check connectors , 5 in particular are on properly. If that doesn’t work you may have damaged the power button assembly and it may be constantly on which is why it keeps rebooting. Or worse the power fuse on mainboard.

I have the same problem. Check this post http://daveaubin.getpaidfrom.us/2008/04/… Recover Mode:

  1. Hold down the top right button and the round bottom middle button for about 10 seconds while in the charge jack that you had last synched from that’s connected toyour pc.
  2. The phone will go dark. Release the top button ONLY. While the iPhone is still plugged in. This is the key to getting itunes to recognise the iPhone in recover mode!
  3. Notice the iPhone now shows up in itunes and itunes detected your iPhone is in recovery mode with this popup: iPhone Recovery Mode
  4. Click OK and then begin the reinstall your firmware.

Already tryd this. And after the restoring or updating finishs it keeps rebooting again. And if you got lucky after 2 hours of rebooting it will start normally for a minute or less then the screen freez for 5 minutes then restarting again and again. Its a hardware problem. Any way I got iphone 4 now and I disassimbled my 3G and donated the enternal parts such as the LCD screen, digitizer, speaker, antenna and the bottons to my frinds :)

Let the phone’s battery go completely dead… I mean dead to the point that the “charge battery” screen no longer appears when you press the ‘home’ button. (The logic here is that if the power is completely removed to the system it may reset the internal components.) I think that you’re most likely going to have to take it apart but I’d try this ’no cost’ possible fix first. Give it a try - nothing to lose but time at this point. Good luck!

Refer to this video to fix iPhone restarting problem.