Solved can't boot from external hard disk

I install FreeBSD on external hard disk,it works well until yesterday. I also had a linux system installed on an external hard disk. Yesterday I play steam games on linux, and then I want to use FreeBSD. But system cannot boot, linux system can't boot too. There's no external hard disk shown in BIOS boot option. What's wrong with it? I thought there's something wrong with my BIOS, so I adjusted some settings, after that BIOS disappear, I can't enter BIOS by pressing del.
 
Is this a USB harddisk?

If so, commonly:
  • Try a different USB port
  • Try a different USB cable
  • Try the harddrive on a different computer and see if something shows up
  • External harddrives can die randomly - like any memory - maybe even more so
 
There's no external hard disk shown in BIOS boot option. ...
I can't enter BIOS by pressing del.
You have bigger, and not FreeBSD specific problems. Before even going to what jbodenmann suggestion (all reasonable ideas), get your BIOS to work correctly.
 
I adjust some BIOS settings and when power on pressing del I see a blank screen, I press F9 and F10, and it's back to normal.
Thanks, men.
 
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