Go into BIOS and put those DISABLED settings into ENABLED or AUTO the same way you used when you disabled them.
I tried several times going to each; hdd, cd, and usb, select "enable" but they still show with brackets. Its like there's something I'm missing or the bios is screwed up. btw, I didn't actually select "disable" to start with, I went in and changed the boot order by moving the usb to first, exit from that screen and that's when they all showed with brackets. Never seen this with bios settings before. I have tried Google search for other ideas.