Suddenly the computer had the error message to insert boot device..Since I am unable to get to safe mode, I keep coming to the MSi BIOS page..So in trying to change the 1st boot option, I'm not sure which one to choose There is Hard Disk WDC WD1010ZEX-00KUWAO, and the USB HARD DISK. By the way, after this happened the first time, I was able to click on "start normally" which I did and after a few hours it suddenly went back to the black screen with the error message.