Unresponsive Keyboard and Mouse after boot (RHEL6)

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http://www.linuxquestions.org – Had to physically move a PC to a new location within same office. RHEL 6 Properly/cleanly shut down PC. Removed cables including USB keyboard and USB mouse. Plugged cables back in including same keyboard and mouse. Powered on. Keyboard not working at grub menu initially. Desktop login screen - no keyboard (still) AND no mouse. Moved USB connections to physically different ports and power cycled... Got keyboard to work at grub AND BIOS AND Diagnostics showed mouse was working within the Diagnostic interface screen. Boots to desktop login screen, no keyboard/no mouse... Tried different USB po (HowTos)