Imac G5 middle screw?

[SSG]

I went to open my Imac today to upgrade the RAM, had no problems with the two screws on the left and right. However, the middle screw is just turning & turning.

If I turn it anti-clockwise to loosen it, it just turns & turns.

If I turn it clockwise to tighten it, it just turns & turns.

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What's up with this? I've had previous experience in opening Imacs & have not encountered this before, anyone else had any similar problems?

It's essential for work reasons I get in to the Mac to put the RAM in before tomorrow.

Any ideas?

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[Aptmunich]

Is this the first gen iMac G5?

The screws aren't supposed to come out, they're designed to come down partially, but mostly stay in there.

Try pulling it gently, maybe it will already come off?

If it's a later iMac G5 - they only have 2 screws.