Internal Hard Drive can't find on BIOS Boot Priorities?

Hey Denzell. What program did you use to merge the two partitions? Perhaps the MBR is messed up because of that. You could try connecting the drive to a different computer and use the same program if it allows you to repair partitions and especially the MBR or you could try and search for such a tool on the net.

Hope that helps.
Boogieman_WD