Take the 2-minute tour ×  I am looking for understanding to a
boot issue. I have at times had some files and such that I save
and retrieve from my thumb drive. I use the front panel as it is
nice and easy to get to and I typically power down my system
nightly. If I forget to pull the drive and power on the system,
it becomes the first bootable device. As there is no OS on the
USB Drive I get the BOOTMGR is missing press CTRL+ALT+DELETE.
When I go into BIOS to see Boot sequence, there’s the thumb
drive up top, DVD drive is missing and not found in the list of
devices. All of the hard drives are next in line.  When I pull
the USB drive, and reboot, everything is back to normal. Old
boot sequence is in place, DVD drive right where it should be
and no issues. So why does this happen with a USB drive in port
at boot up? If it can’t be booted from, shouldn’t the next drive
be attempted?  Note: This happens when the thumb drive is
plugged into a USB port on the front panel. It does not seem to
happen on rear panel