


There is another setting that works in conjunction with listing the order of boot devices in the bios, try looking under Drive Priorities, or similar wording, within that it lists your hard drives, including USB ones (on mine anyway), within this option you tell the system which of the hard drives is to be the 1st drive to use, make sure your OS drive is listed as the 1st drive in that list, then go to the Boot list, and make sure the hard drive is the 1st option (it's faster), followed by the optical drive as 2nd, TBH any further boot options I simply set to disable, then it wont waste time looking for what isn't there, see if that helps.
