Hum on standby

[harsaphes]

Hey guys...when my computer goes into sleep/standby there is a deep hum that comes from the case....this doesnt happen when the rig is being used. Any ideas what is causing that?...Power supply? ..and if so why?
Thanks.

 

[criccio]

Does it happen when its shutdown? What sleep level is your BIOS set to?

 

[harsaphes]

no hum on shutdown. Bios?..suspend is set to auto.

 

[criccio]

It's most likely the power supply, but i'm curious what level of sleep you are using (yes, there are a few).

http://arstechnica.com/phpbb/viewtopic.php?f=8&t=354552

Looking at your motherboards manual, it looks like Suspend Auto allows the OS to select a state. Try and change that to S3 and see what happens.