Hello I have the same problem. I did clean the HDD and the computer boots in windows. HDD was scanned and says its error free. This morning i turned the laptop on and no HDD was recognized but after applying pressure above the connector of the HDD board (near alt car key) it booted normally after the second try. Has your issue persisted? I'm thinking of strengthening the connector joints as per this video https://www.youtube.com/watch?v=DXrZd5cF... because the solution above was only temporary. Have you tried doing this or your issue was solved the first time? or did you replace the HDD board? Thanks in advance