I would have done as you have done so far. You did not mention what operating system you are running. For your laptop look on the back and see if you can identify the screw that holds the drive in place. If you can find it take it out and carefully ease out the drive. Start the laptop and then shut it down normally. Put the drive back in and restart the laptop. If it is seen it may now work ok. If it is still not seen it could be that the drive has died. You should be able to obtain a replacement drive fairly cheaply.
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