Press and hold the f2 button then click the power button. Then your computer can boot from the usb.
The boot order in the bios is set dvd removable device first hdd it will sometimes boot from a usb stick but it doesn t boot consistently from a usb.
Asus motherboard boot from usb. Click boot enter the configuration of boot option 1 select the proper device. After entering the bios configuration press hotkey f8 or use the cursor to click boot menu that the screen displayed. From the menu choose the usb drive and press enter.
In my case mb s bios update was also needed. How to enable asus bios boot from the usb or cd drive. The only way i have found to boot.
1 enter bios select boot select usb drive cd rom under the boot override options 2 enter bios select boot change the boot device priority so that your usb drive cd rom is the first boot device. If boot menu doesn t show usb flash drive cd rom that you want to use please continue to step 3 and after to adjust relevant settings. Enter the bios configuration of the system.
Select usb flash drive cd rom in boot menu that you want to use then press enter key to boot the system from usb flash drive cd rom. In my case mb s bios update was also needed. Save and exit bios to keep this setting but you may want to change it back later to avoid booting to external devices disks accidentally when they are plugged in installed.
After that connect the usb drive to the asus computer and power on the computer. Then press the asus boot menu key to open asus laptop boot menu. I have an even older asus board atx z77 m and it did work with clover bootloader which you can burn to a spare usb stick.
The settings may various depended on different models.