I bought a PC recently from a firm that specialises in putting together music systems. I've only just noticed today that the USB ports all supply power without the machine being turned on. All I have to do is turn on the mains and all my dongles light up like a Christmas tree. Is that normal? Shouldn't the USB power be dependent on turning on the rest of the motherboard? (It has been on all my other machines but maybe this is some new 'feature' I was unaware of?)
Thing is I'm worried that the machine might be running hot as well. I've only really had it turned on for an extended period once - when I installed all my Native Instruments stuff. By the end of that time the top of the tower was hot. I tried persuading myself this was because I'd just had the DVD drive going non-stop for two hours - but my other machines cope with that without the cases ever getting even warm. Now I'm worried that the machine is crosswired somewhere, and that I may be blowing components as I use it.