Try accessing the BIOS and press F9 to set the BIOS to defaults settings and then press F10 to save any changes.
- 1) Format USB stick with either FAT 16 or FAT32.
- 2) Add a delay to the boot, you can delay to boot by accessing the BIOS and under Devices click SATA and set the hard disk pre-delay to 5 or 10, this sometimes can help with the proper load order.
- 3) In the BIOS you can also set the USB to boot first, under the boot menu click on boot configuration and then click boot USB devices first.
If the problem persist I would recommend submitting a warranty request for the unit if it is still under the three years warranty, you can submit your request here: