The sprung-loaded pins on the motherboard

There are some interesting sprung-loaded pins on the motherboard!

Anyone know what they are used for other than possible test points?

I have an idea.

I have been having problems for the last few days where my MBP will just shut down randomly and it started not long after I lost a screw (the second ) from the base plate. MBP kept shutting down for no obvious reason.

Apple could not find a hardware fault

When at the genius bar I asked them to replace to two screw... since then the MBP has been stable, so I reckon those pins have a grounding/secure point - if no proper contact with the base plate the board issues a shut down, like a close-door replay switch!

So - have I hit on a possible issue, which may solve problems for others?

Antony