No grounded outlets and the Mac Pro

I live in an older house w/o grounded outlets and have been using the small plug adapters that go on the end of the power cord.
What are the ill effects (if any) of using my new Mac Pro in this configuration?
Thanks

Not a lot of risk. Electrocution and fire.
I assume it (house) is not so old as to not have plumbing?
Get a 2 to 3 prong adapter with a ground tab. Connect a wire from the ground tab to a water pipe with a clamp for this purpose (from Home Depot) . Plug the MacPro into the now grounded outlet.
http://www.trianglecables.com/polarized-grounding-adapter-3-prong-outlet-to-2-pr ong-plug.html (75 cents plus the wire and clamp)
These ones use the screw for the cover plate to ground the adapter to the house, though you need to make sure there is a metal box and that box is grounded. Or use the pipe.

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