IPhone 4 stuck in Apple logo screen

I have an iPhone 4, that I had to replace the LCD, power switch - proximity sensor cable, and home button on.
After I had made the repairs (after making sure everything was reassembled correctly) I then proceeded to turn the device on.
Now it will only display the Apple logo at startup.
When I turn the phone off (via the Home + Sleep/wake method) it will sometimes revert back to the Apple logo screen.
I have reset the phone (gone through recovery mode) at least 5 times to correct the issue, yet it still is not working correctly.
The only software change that had been made to it, was that I had updated it to the most recent version of iOS. And that was approx. 2 weeks before the issues with the phone.
Is there another solution to fixing this phone, or is it basically done?
(If I can, I really need to get this phone fixed (if at all possible).
Thank-you.

Thank-you for the reply.
I have checked the charging port. It checked out to be good.
I then checked the following flex connectors:
Digitizer - it checked out ok
LCD - While it did check out ok. I wonder if it might have a defect in it. (because it does flicker)..
Earpiece - checked out ok.
Front Camera - checked out ok.
Power switch / proximity sensor cable.- Bad...
During my testing of the phone, any time I would turn the power on to the phone. If I unplugged the connector for the power switch. The iOS would continue to load, but if I left it plugged in. Then it would stay on the Apple logo.
I will reply to this thread after I receive the replacement part, and I have had a chance to check it out (to make sure that takes care of the problem.

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