Has anyone here left their powered mixer on over night? If so, does it get very hot somewhere on the back of the unit?

And should I hear the fan a little bit like my computer fan?

This fan when I get close seems to have a very slight rattle. Do you think this is cause for alarm?

This is the Behringer PMX2000 I'm talking about.

As you can see I'm a bit worried.
Thanks again,
Boo