Hi. I have a problem with my iphone 5.

Hi. I have a problem with my iphone 5.
The situation is that it will not switch on or do anything if i press the power button. But if i connect it to a pc or charger, it keeps flashing the apple Logo, but thats it.
Cannot restore it, says error 21.
what could be the problem?

Check for hardware issues
Related errors: 1, 3, 10, 11, 12, 13, 14, 16, 20, 21, 23, 26, 27, 28, 29, 34, 35, 36, 37, 40, 1000, 1002, 1004, 1011, 1012, 1014, 1667, or 1669.
Try to restore your iOS device two more times while connected with a cable, computer, and network you know are good. Also, confirm your security software and settings are allowing communication between your device and update servers. If you still see the error message when you update or restore, contact Apple support.

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