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making sound on power up

Pandiyarajan R V
Prodigy 245 points

Hi

I have an issue on EVM board.

One board is making sound on power up..

As it is a socketed board,i removed the processor and checked it,there is no sound.but on placing the processor it is making sound..

The board is fine(no short r low resistance in any voltage rails)

Then i isolated a inductor in 5V rail,no sound.The inductor I had isolated is an inductor in buck converter like shown below.

What will be reason/cause for this sound

1.Is the inductor gone bad?

2.any other device in the power rail is causing the problem?

or any other thing that can cause this kind of issues.Kindly Share the ideas to solve this issue.

Thanks 

Rajan