Mac Pro power off suddenly when remove power cord

hi, i've just got my new apple mac pro from the store fresh for 2 months, and my battery cycles have been only 13.
just now when i accidently uplug my powercord, it shut downs instantly, i'm so worried about this, i'm having a final exam in 2 weeks, and if it keeps happened like this i'm gonna be so unhappy.
is this a serious problem, anyone getting this ?
can i change it to new one at the store ?
I'm in Melbourne, Australia

That certainly isn't what should happen — the machine should instantaneously and seamlessly switch over to battery power when the MagSafe plug is disconnected, unless the battery is drained or dead. What was the state of your battery when this happened?
Please test again, with your battery fully or partially charged, the machine running, and no documents open. Disconnect the MagSafe connector properly by holding the plug and tipping it downward until the electrical contact is broken. Does the machine shut down or keep running? Post back with results.

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