iPhone4 is powered off when it runs out of power, it can t be turned on, DFU can not be charged, and

Try pressing the power off button and home button at the same time for more than 10 seconds.

If there is no power at all and you need to charge it for a while, do you plug it in and it doesn't respond at all or does there be a charging icon? If the power is completely empty, there may not even be an icon that is charging...In addition, pressing the switch and home at the same time to forcibly power off for a few seconds may solve the problem (but you may have already tried, after all, you have to try close to DFU, if you haven't tried it, try again)...I don't think it's a hardware problem, check if the charger enters protected mode so that it doesn't charge the phone temporarily, if you have another iPhone, you can see if the same charger and cable can charge another iPhone, or plug the cable directly into the computer to charge for a minute or two to try....

Software problems, just upgrade it, but back it up in advance.

Two possibilities. Software Hardware.

Software issues. Connected to the phone after the iTunes system was compromised. Please reinstall iTunes, reconnect your phone, and reflash your iOS system.

There is a problem with the identification of the charging voltage and charging status of the mobile phone system, please re-flash the iOS system.

Hardware issues. Using an inferior or problematic charger to charge the phone, or even using a charger that does not meet the voltage and current standards to charge the phone, resulting in problems with overvoltage and overcurrent protection, and the tail plate needs to be replaced.

The use of inferior plugs or rough use of plugs, resulting in poor connections, the system enters a protected state after powering on, and charging is not allowed.

Clean the connectors, plugs, or replace the cables, or need to replace the tail plate.

Is the owner of the flashing machine solved? I'm having the same problem as you right now.

Just change the original data cable! ~

Generally, the voltage is not enough or the data cable is not original, which can be solved by the following methods:

1. The voltage is not enough: it is recommended to change the socket, if it was originally plugged into the computer for charging, change it to the socket and plug it in.

2. The charger or data cable is not original: replace it with the original mobile phone data cable and the original charger and recharge.

3. The charging head has been used for a long time or the interface is dirty: change the charging head. Take a thin piece of metallographic sandpaper and cut it out to the appropriate size, fold it in half a few times, and then gently polish it in the interface a few times.

4. The charger or data cable is broken: It is recommended to change the data cable or charger.

I also have 4s. It may be a problem with the phone if it doesn't charge it, but it's usually the charger's plug or cable that is broken and can't be used. I've had one or two broken chargers, and they just wouldn't charge at the time. If there is no way to charge it, it will slowly run out of power and shut down.

Is there a problem with the phone board? If so, get the phone repaired, and the electric board will be activated for a few dollars.

Solution:

1.Go to Apple after-sales service to replace the whole machine and pay a lot of money.

2.Continue charging until it can turn on.

You plug in the computer with a data cable first, and wait until it is charged to about 15% It should be able to be charged (iPad2Some people are like this). You try it, it's not a big problem

Fill it, and you'll be fine in a while.

No matter whether it is turned on or off, it can be charged normally.

This may be a problem with the machine, do you have to manually turn on the machine after charging? If you can't open it, go to the iPhone sales hall and ask. I hope you can adopt, I'm doing the task thank you.

The charging head is broken, which is very common, and several of my friends have just bought the charging head and broken it.

Open iTunes and connect your iPhone to the computer. Wait a few minutes and it will turn on!

Send it for repair directly It may be that the charger is broken.