I have a mac pro 3.1. running OSX 1.6.8. I bought this NewerTech USB3/eSata PCI card recently, from OWC. The card works, however, the computer won't go to sleep anymore. Not even when I tell it to go to sleep. It turns the screen off but the fans keep running and the power button doesn't fade like it normally does during sleep. It's like it only sleeps the display but not the system. I have tried: - resetting the PRAM - resetting the SMC (though I'm not sure if that worked, counting seconds seems a little unreliable to me? I tried several times) - starting up in safe mode - plugging the card into different PCI slots None of that worked. The computer sleeps only if I remove the card. But that's not the solution, because I really need the extra connections that it provides. Does anyone have similar experiences? Or maybe some ideas what else I could try to get it to sleep with the card in it? Also, is there any other way to reset the SMC on my system, other than that thing with unplugging, waiting 15 and then plugging in and waiting 5 seconds… because I'm never 100% sure that I waited the right amount of seconds and whether it actually worked? Is there some way to check if the SMC reset has worked? Many questions. Thanks in advance for any help!