i left the comp off all night, and today it has been making a really obvious metal ringing sound, exactly the same kind of sound usually heard at airports, albeit louder.
it's kindof like a mini jumbo jet screaming metal noise, and i've looked at all the fans. it sounds as ringy as an old fridge at the moment, and i've just migrated to a new case that has been okay for a fortnight.
anyone encountered similair noises before?