Other things to try...

When the system "freezes":

1) Can you still toggle the caps-lock light by pressing the caps-lock key?
2) Can you reboot by holding down *all* of the following keys combos (do all of 
them):
    alt + sysrq + s
    alt + sysrq + u
    alt + sysrq + b


Also, would it be possible to try re-installing with a 13.10 / 14.04 image to 
see if the behaviour is different?

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https://bugs.launchpad.net/bugs/1256949

Title:
  Dell Latitude E5420 doesn't boot if killswitch is turned to "radio
  off"

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