Galaxy Note won't turn on. Weird behaiviour.

Hi,
I have a Galaxy Note GT-N7000. It was working properly until some day it did not turned on.

When the phone is unplugged form the USB port the phone does nothing, no power, no Download mode, nothing. Even thou I fully charged the battery with an external battery charger... You press power button and nothing shows.

When I plug the USB charger the one sign of life I get is the battery charging icon (image attached)... which shows and then goes blank every 10 seconds. That's all I can get from the phone...

I checked other posts and they say it might be a broken USB port, So i disassembled the phone and removed the USB port flex to check if it might be short circuiting the board; but no luck. When I remove the USB port the phone does nothing.

Any ideas? Could it be the phone has a broken USB port and that the phone can't power without usb port?

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