crwdns2934241:0crwdne2934241:0 QEII Student IT

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Is the machine getting very hot? It is possible that the fan is trying to cool the machine but can't so the machine turns off to protect itself. I have seen iBooks with faulty fans that don't turn on because they know they will get very hot very quickly. 

crwdns2915684:0crwdne2915684:0:

open