Mouse and Keyboard not working - windows 8.1 64gb desktop

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I have a three year old dell inspron desktop running updated windows 8.1 64bit. Suddenly NONE of the input devices are working. I've tried several different wireless mice, and I've tried both a wired and wireless keyboard. NOTHING. I've tried using different ports (both on the computer on on my splitter) I've tried unhooking both devices, rebooting, then hooking them back up... looks like its loading drivers, makes noise, but still nothing. Tried rebooting with them installed. ARRRGGGHHH. Since I have no keyboard I can't do safe start.

Any idea?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References www.cnet.com/forums/discussions/mouse-and-keyboard-not-working-windows-8-1-64gb-desktop/

whiteboard video examples