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You can melt superglue with acetone (the main ingredient in nail polish remover) but it's likely to also melt and/or damage the plastic around the port. You would definitely want to test acetone on an inconspicuous part of the case first to see what it would do.

If possible, I'd say carefully cut the thing out and sand/file off any jaggies.

Or buy a new Mac.

KingFred wrote:

You can melt superglue with acetone (the main ingredient in nail polish remover) but it's likely to also melt and/or damage the plastic around the port. You would definitely want to test acetone on an inconspicuous part of the case first to see what it would do.

If possible, I'd say carefully cut the thing out and sand/file off any jaggies.

Or buy a new Mac.

Even as aggressive as acetone seems to be it's actually quite harmless to most plastics.

Well, we have to remove the dongle because he switched computers and it's on his old one. I guess we'll test it with a small amount of acetone. Our IT guy didn't seem too confident when we told him we wanted to try that, though.

Yes, we've tried jimmying it every which way, but the thing is stuck solid. I'll mention your other suggestions as well.

Yes... If you leave certain plastics in pure acetone for an extended period of time, they will start to disolve.  Key words here, folks... 'certain' 'pure' and 'extended'

Using enough acetone to disolve the superglue on the connector shouldn't cause any problems, and acetone by itself is very volatile.  What that means for our practical purposes is that with any airflow, it will evaporate from the connector on the Mac before having chance to do damage.  If you are using nail polish, which has been noted as being dilute acetone, its all the less likely to cause any appreciable harm.  But the advice to try a dab on the back of the machine to check if it will cause cosmetic damage is sound as well.