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ACER ASPIRE 7738G-664G50MN serial No LXPFTOC00194105F4A2000 locking for Mac adre

Is this a lost or stolen computer? If so, there is no way to locate it via its MAC address unless something like Lojack for Laptops was installed before it was lost or stolen.

Your only recourse is report the item to the local police to file the loss/theft. You may also be able to file a claim with your insurance.

Sorry, but you really have no other viable options.