boot device not found 3F0, and i am doing all the method which f10,then default but not worked?
That message can be generated for more than one reason, however by invoking the F2 at startup, it will run the diagnostics to see if the hard drive has failed - most likely reason.
When before starting, start tapping either the F2 or Esc key. press the power button to start while tapping the Esc or F2. when the menu pops up, pick the diagnostics. If it says all is fine, then you need to run a Windows repair or reinstall.
Return with results and get additional continued help.
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