Stuck in Boot Loop with NAND error message on screen.

Ive had this 4S for quite some time. Its had a screen repalcement and a few color changes before giving it to my wife when I upgraded to the 5.

I did a pink color conversion for her and accidentally ruined the power button. I ordered a whole new midframe assymbly and transplanted everything over yesterday. Now it looks like a COMPLETE new phone. Everything worked great and I was the hero of the day.

We were playing around on our phones in bed and she was reading something on her phone. I said "Bet its nice having a working power button now right!" and I leaned over and pushed her power button closing what she was reading.

And that was ALL SHE WROTE! When she hit the power button again the apple logo appeared.

It stayed on the screen like 4 minutes. So I held down the power button and home button until the device rebooted.

Now it just kept rebooting and rebooting. Never getting past the Apple logo. Eventually I saw the Apple logo and a bunch of white text at the top of the screen. NAND something 600, findandfixflash something. I started to freak out. I plugged it into the MAC and it didnt register. So I entered restore mode until the itunes logo appeared. The mac recognized it. It went through the whole restore process and rebooted.

And then it just kept rebooting over and over and eventually the same NAND error.

I took it apart. Cleaned all connectors, checked everything. It looks good. Put it all back together and nothing. Same story. Then entered DFU mode and did a restore. After the restore it started rebooting all over again.

This has never been tampered with as far as jailbreaking. It was never water damaged. I can NOT figure this out to save my life.

It was working just fine and then this.

Any ideas?? Is it dead?

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