grounding clips preventing phone from turning on?

Hello, I changed the LCD on iPhone 4S and when I tested it, everything was OK. Then I placed the screws and grounding clips back and it won't start anymore. After removing the top grounding clip and metal motherboard cover, it's OK again.

Any ideas what could be wrong? I think there must be a short circuit, but it doesn't make sense to me...

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There are about 3 of them which look similar, one that sits near the battery connector which is black, one next to the rear camera which is gold, and one that sits near the 3 ribbon cables at the top right of the logic board.

The two on the left side of the phone aren't required.

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The problematic one is near headphone connector...

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