Why is my iphone4 not charging?

My iphone won't charge and when i plug it in the charging sign shows but the iphone doesn't charge. The battery is now dead. Everytime i plug the charger in now the iphone turns on and as soon as it finishes turning on. It dies again. This just keeps repeating itself.

Please help.
I have taken it to a repair show and they have tried to put a new battery but it still won't charge. They have also tried putting a new charging port but still it won't charge. They have said that it might be the motherboard.

Why is my Iphone4 not charging? - 1

My iphone won't charge and when i plug it in the charging sign shows but the iphone doesn't charge. The battery is now dead. Everytime i plug the charger in now the iphone turns on and as soon as it finishes turning on. It dies again. This just keeps repeating itself.

Please help.

Added (1). I have taken it to a repair show and they have tried to put a new battery but it still won't charge. They have also tried putting a new charging port but still it won't charge. They have said that it might be the motherboard.

How to get my twitter account onto my iPhone?

I have my twitter account on my iPad and recently got an iPhone and want my account on my iPhone too. When I go to log into my account in my phone it doesn't let me in so I thought I should change my password, so on twitter it sends you a link to change it through your email address but I can't remember what email address my account is on, is there anyway to find what email I have used, any help is grateful

I want to upgrade my iphone 4. What should I do? Which OS?

I have never updated my iphone. It is still having ios 4 in it. Now, most apps are not getting supported by ios 4. They require ios 5. But whenever i go to itunes to upgrade it shows to upgrade to ios 7. I have heard that ios 7 is not good for iphone 4. What should i do?

How long should an iPhone 3GS last and an Acer Aspire laptop?

I ought an iPhone 3gs 2 and a half years ago.
I bought the laptop nearly 2 years ago.

Both are in good condition, but regardless of that, when should I replace them ( because of better technology OR because of needing to replace it ) ?

Added (1). *
The laptop is slow, and the battery life of the phone is poor.

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I'm working on an iPhone app.

I want to use band name and song titles in design mockups that I'll use on the app's website and in a presentation. Do I have to ask permission to do this? I know that band's name isn't a trademark now, but I want to be aware of the possible future consequences, when band's name may become a trademark and band may sign up to some big publisher like Sony or Warner.

Also I want to use album covers (like in iPhone's Music app). I know that such works are copyright objects. Whom should I ask for permission if the band is signed to label?

And what about photos? Should I get permission only from photographer or from band/label too?

IPhone 3g needs to be updated

I have a jailbriken iPhone 3g iOS 3.1.3 with cydia which I want to update to 4.1.2 (as its the highest for 3g). I want to know if I can update it by directly downloading the software and then shift+Restore or I have to first un-jailbreak it.