[SOLVED] Metallic clicking sound coming from motherboard

[NinCollin]

I've got this dual Xeon PC that has some quirks but is otherwise functional and usable. One of those quirks is a strange metallic clicking sound coming from the motherboard. It's a single, short sound like a "plink."
It begins once the PC is turned on, and decreases with frequency as the time passes. Once turned off and/or unplugged, the clicking sound resumes for a while.

Things it is NOT

• PSU
• Hard drive
• CPU heatsink
• Computer fans
• GPU
• A wire hitting something

My only logical theory is thermal expansion, since it eventually stops after the PC is on for a while, and starts up again when the PC is turned off and thus cooling down.

 

[alceryes]

Weird.
Use the inside cardboard tube from a roll of paper towels to pinpoint the sound. Open the side of the case, put one end to your ear, carefully move the other end around to different spots around your system until you find about where the sound is coming from. Does this motherboard have a little piezo speaker?

 

[NinCollin]

It's got a full sized external PC speaker, so it can't be that either; I'll definitely use a tube to try and figure it out though. Good idea