Why can't my iPhone 3GS be detected in my computer?

michael29angelo · Jan 17, 2015

My iPhone 3GS 6.1.6 can't be detected by iTunes, computer, and other softwares.

I've already tried using another USB and another computer but it didn't work.
The screen of my phone is completely black.
Whenever I try entering DFU or recovery mode, it won't work.
I tried charging the phone but nothing appears on the screen.

What should I do? It is a second-hand phone and before these events happened, I've jailbroken this phone unsuccessfully. Please, help!

J. A. · Jan 17, 2015

Welcome to iPhoneForums, @michael29angelo!

I hope this tutorial will help with your problem:
TUTORIAL - Failsafe method to restore the current version of IOS Apple iPhone Forum

Nice username, btw.

michael29angelo · Jan 17, 2015

J. A. said:
Welcome to iPhoneForums, @michael29angelo!

I hope this tutorial will help with your problem:
TUTORIAL - Failsafe method to restore the current version of IOS Apple iPhone Forum

Nice username, btw.

Hi! Thanks for your reply! I really can't access DFU mode. I do it correctly. My computer doesn't detect my iPhone 3GS. Even on other computers with iTunes.

scifan57 · Jan 17, 2015

michael29angelo said:
Hi! Thanks for your reply! I really can't access DFU mode. I do it correctly. My computer doesn't detect my iPhone 3GS. Even on other computers with iTunes.

There's only one reason for an inability to enter DFU mode and that's a hardware problem. If you exactly followed the directions for placing your iPhone into DFU mode and it won't, you should consider taking it to the Genius Bar at an Apple Store for a full diagnostic.

michael29angelo · Jan 17, 2015

scifan57 said:
There's only one reason for an inability to enter DFU mode and that's a hardware problem. If you exactly followed the directions for placing your iPhone into DFU mode and it won't, you should consider taking it to the Genius Bar at an Apple Store for a full diagnostic.

Hi! Thanks for your reply! Where do you think is the exact problem?

scifan57 · Jan 17, 2015

It's impossible to tell if you can't get the phone to work. That's what the diagnostic at the Apple Store would tell us.

Before going to the Apple Store, though, try a few more times to enter DFU mode using every method in this guide, if necessary. Enter DFU Mode Restore Iphone without any errors

Coastiejoe · Jan 24, 2015

Chances are it is a MotherBoard issue. The 3g phone is simply old and it does not like all the updates that are out there. For some reason, the update seems to kill the MB..