-   I have changed all batteries, including the backup battery, I've removed the batteries, held the "on" button down for 10 second to reset, reinstalled batteries and calculator still won't stay on. It was just purchased in Aug. 2009-   swat865
my gc can't work at all, after i tried to install some necessary applications. where can i get it...
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my gc can't work at all, after i tried to install some necessary applications. where can i get it fixed?