I had a problem with my 4 yr old "Dell" recently, not the same problem as you seem to be having, (my keyboard went dead), but this "might" help? Sounds daft I know but this came from the "Dell" helpline.. directly under the L/R buttons there's a screw holding a cover to some type of compartment..I was told to undo the screw too loosen this compartment..then they told me to put it back, tighten up & restart the computer..that was it..some sort of reset activation!
Al.
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