Please Help! My iPhone 4 won't power on!

iPhone 4, out of warranty coverage, won't power on.
    1.    It has about 60% battery before it dead, but suddenly it became black screen and not responsive (like powered off).
    2.    Whatever I did, like "holding the power button and home button together for 10-25 sec and then pressing the power button again" etc. it just won't power on, no Apple logo!
    3.    But I can seen the "emergancy call" screen when I plugged it with my laptop and it just told me "No Service" at the upper left corner (status bar of iPhone 4).
    4.    iTunes can see it, but only when it was in Recovery mode or DFU mode.
    5.    I also tried to restore it to factory settings in iTunes, but it always gives me an error with various error codes, like 2001, 2006, etc. I also tried restore it under Windows or Mac, but was out of luck too!
    6.    Finally I bought a iPhone 4 battery replacement and replaced the old one with the new one, but nothing changed as if it wasn't replaced its original battery.
    7.    It keeps rebooting at every 10 min or so when It was plugged into my laptop without any operations (pressing any buttons).
    8.    It can be "powered on" only when it was plugged into a computer. It will IMMEDIATELY be in "dead mode" as long as I disconnect it from the computer (like taking out a battery from an iPhone that is powered on)!
    9.    Everything worked fine before it dead, I don't know what happened to it! I am so frustrated!
Please help! Thank you so much!

USB Problem, possibly bad Cable.
I misread your original post "It keeps rebooting at every 10 min or so when It was plugged into my laptop".
I thought you had a boot loop problem, but you say "rebooting when plugged into laptop" this is not the typical boot loop problem, because you had the iPhone connected to laptop.
Connected by what, obvioulsy a USB Cable, Error 2006, is most often due to faulty USB Cable.
Clean that Dock Port Very Well especially with Isopropyll Alcohol, get a good USB Cable, try a different USB port on computer, or try a different computer.

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