Sometimes (e.g 5%) I boot the computer and either the mouse (usb), or the keyboard (usb), or the monitor (dvi) will not work although the devices are powered. Nothing different is been done while shuting down (before the boot) or while booting. The pattern is totally random. The solution is always to unplug the offending device (mouse, keyboard or monitor) for 2 seconds and then replug. It then immediatelly works.
I run Win 7 Pro SP1 and my computer is a 2 years old with no viruses or cracked software installed. A CPU-Z dump of my current setup can be found at http://pastebin.com/6irDKXfv
Any ideas on where should I look at?