If Voting Machines Were Hacked, It Might Not Be Obvious : NPR
learn to use Google search (<rolls eyes>)
Yes and no might be the answer.
Electronic voting machines have software, so it is possible, however unlikely, that the voting machine software might have been compromised and not the actual vote tally -- it might have been corrupted before the first vote was made thus altering the count.
There is no proof of this having occurred in the past general election.