Step one, run diagnostics just to confirm the drive integrity. Next check the Boot Menu to make sure the boot drive is listed first. After that perform an MBR repair (possible MBR corruption) as explained here at the partition wizard page. After that try another drive and clean install Windows. If that does not help replace the CMOS battery making sure to leave the old battery out of the system for 15 minutes before installing the new battery. If none of that helps then you start digging deeper into a possible MB problem. Now if we are talking about a SATA drive then after running diagnostics, and assuming the drive passes, replace the SATA cable. Least likely but possible cause, a problem with the SATA power connector from the PSU, though I have never seen that as the cause.
No bootable device found? What is your go-to fix? For more questions regarding this contests, please visit the Contest Information Page here.
DS 07/20: No bootable device found? What is your go-to fix?