Computer ขึ้นคำว่า No Bootable Device

Computer Screen Show : No Bootable Device
My Computer is Acer
Last Time I Change Bios Battery
Computer is On
There are no problem
.....
And This Time I again Change Bios battery
But computer screen show
.... no bootable device ......
.....................
You can do this
Continue to Press Start Button 3 - 4 second until screen is off
Then press start button normally ( 0.1 second)
and press F2 button many time make bios change to boot menu
In boot menu Do As I Show
.....
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