Hi,
Shut down the notebook - do this by holding down the left Shift key as you click on Shutdown to temporarily prevent a hybrid boot.
Tap away at the esc key as you start the notebook to enter the Start-up Menu. Select the Diagnostic Menu option ( f2 ) and run the Hard Drive test(s). Post back with the details of any error messages.
Can you also post back with the full Model No. and Product No. of your dv7 series notebook - see Here for a guide on locating this information.
Regards,
DP-K