Till yesterday everything was fine. Today when I tried to run my computer following message appeared on my screen; 'Reboot & select proper boot device or insert boot media in selected boot device' I completely have no idea what the problem is as it happened to me for the first time.. My HDD is working/running but somehow I think my computer its not reading it, no clue why. Maybe its SATA cable fault? I have no idea how to check where the problem comes from? Can someone help? Sorry for my English. Hopefully u know what I mean..