I Have A HP 6450B Probook laptop

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I was told when I received it they ran A program that killed the hard drive. When I hit the esc key. f1 system information f2 system diagnosticians f7 hp sparekey f9 boot device options popsup and so on. From f1 - f12 which ever I click on takes me to the same page. system Diagnostics page. f1, f2, f4 passes with flying colors but f3 run-in test keeps going over and over. Could bad memory sticks cause this.