No Power through the USB ports/devices not being detected

viral908

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Oct 6, 2014
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http://tinypic.com/r/xkr408/8
My system config is as indicated by the screen cap.
i'm using zebronics 650w smps with claimed efficiency of 85%+

For the past few weeks, my keyboard and mouse would randomly disconnect and reconnect and after a few times would permanently power off unless i restarted the system. the problem has become more and more frequent and acute. my system is otherwise responsive.
finally last night alongside the existing problems, my other USB devices(printers, scanners, USB data dongle) stopped communicating or even being detected.
i booted up my ubuntu installation and the problem seemed to persist.
I should also not that my flash thumb drive does work on certain ports.
and that i have been having connectivity problems with usb storage devices(flash drives and mobile devices) for sometime before either of these problems cropped up.
I even flashed my bios to the latest version to no avail.
any ideas or pointers?
please & thank you.