My Iphone Will Not Restore, Please Help.

Question

Hello,
I fell asleep while facetiming, I woke up and found that my iphone will not turn on, which is odd, since I was charging it. I then took it off my charger and then put it back on. The Iphone 4 then showed the Apple Insignia for about 10 seconds, then became a dark screen, then back to the insignia. It did this repeated flashing for a good ten minutes. I then took it off the charger and the phone stopped flashing and it became totally dead. I tried pressing the home button, and the top button, but there was no effect. I then plugged in my Iphone to the computer and put it into recovery mode. I tried to restore it, but it continually keeps getting an error (21). I tried it on a different computer, will not restore, but got a different error (I believe it was the error (1604)). I tried restoring it multiple times, I updated my Itunes to the latest version, I made sure my connection was well. I tried taking my Iphone off of recovery mode, but it did not work.
I suspect that my problems are due to the fact that my Iphone will not stay on without being connected to a power source, and that is the reason for all the errors. I tried it on different USB ports and different computers. Please correct me if I am wrong, and please help me figure out what I should do next. I do not mind losing all my contacts, but I do mind if I have to spend money on a new phone, afterall, I barely even had this phone for a year.
So Please, I am begging. Please help me and tell me why doesn't my phone stay on without being connected? Is it because I fell asleep while facetiming and because neither of us hung up it over-heated and killed the battery? Is there an easy way to fix this since I am technologically-impaired? Is there any hope for me and my Iphone's future?
Any answer will be very much appreciated.
Thank You.

Answer 1

It sounds to me like you either got defective parts or otherwise did not make the repair correctly. We cannot help  with self-repairs here, the iPhone officially not user servicable, but you can ask for advice in the forums on ifixit.com, a site which is dedicated to those attempting their own repairs.
Regards.