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Tip

Motherboard gone bad?

Jul 3, 2015 5:30PM PDT

Discussion is locked

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Long video but did you reboot?
Jul 3, 2015 6:28PM PDT

And did you pull the power plug and hold the power button for 1 minute than release, try again?

Also, why the USB chain? Try that other keyboard on another USB port.

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unplug everything else
Jul 4, 2015 4:28AM PDT

have just a single keyboard, single mouse, single monitor. See if that works. If so, then can add a device back one at a time and test.