At this point, the only thing that could cause this is the 72 pin connector, also, I don't think that boiling the 72 pin connector will help with this problem. You may have ruined the 72 pin connector by boiling it 3 times. Water NEVER fixes electronics, only makes them defunct. In the future if this happens again, just replace the 72 pin connector. NEVER try boiling it again. It is an inexpensive and easy to replace part. Good Luck!