Computer is chirping after shut down. Please help.

[reas]

Hi all. Thank you for taking the time to look and possibly attempt an explanation for this.

My puter is making noises, not unlike a 'CD booting scratching' after its shut down. It does not always do that, and noises last anywhere from a few minutes to hours and hours on end, but ONLY after the computer is off.

I took the PSU out of the case and gave everything a good listen. It was very clear that the noises were coming from the mobo, from where all the peripherals get connected. I unplugged and replugged everything and that made no difference.

There is nothing visibly wrong with the way the puter performs and I checked for viruses, worms etc and it came up clean.

Any ideas please as to why and how to make it stop?

Thanks in advance.

[Zefon]

This may be way off base, But could it possibly be a low battery warning.

Check the voltage?????

[reas]

Thanks for trying but I don't think thats it. The noise does not sound like a warning chirp.

The closest anology I can think of is the sound of an old CD starting up. Kinda a mix between scratching, chirping and clicking. I thought for a while that it was the HD spinning but thats not it. The noises are definately coming from the back of the mobo where speakers, DSL, keyboard etc get plugged in.