If you’re still getting no boot device, enter the BIOS setup by selecting F2 or DEL after pressing the power button. A loose power cord connection to a hard disk is a very likely cause of this problem.
We will troubleshoot fully later, but remember to always check your cables.
The “boot device not found,” “no boot device,” or “boot device not found please install an operating system” error occurs after a user has hit the power button, the system has gone through its initial BIOS system boot process, then at the point the operating system would normally start to load, you get a black screen, maybe a flashing white cursor, sometimes an insert boot disk error messages or a hard disk 3f0 error, then the system exits to the boot partition or recovery prompt.
