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Whenever I try to put my computer to sleep, it wakes up instantly. I have found out it is the USB 3 card I recently purchased which is the problem, as when I disable it in Device Manager my computer sleeps fine. Any ideas? I have tried most of the power options as well.

The driver is a ASMedia XHCI Controller. Generic USB 3 PCI-e card.

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So you have ensured "Allow this device to wake the computer" is UNchecked? Does it behave the same with no USB devices plugged into it? –  Ƭᴇcʜιᴇ007 Jun 17 '12 at 14:39

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