If its something in the bios, then you are looking for an option somewhere, that should be under the heading of "System Boot Order", or "Startup Boot Order" or something that has to do with boot drives order. Normally it will read like, 1. CD-Rom, 2. Master HDD, 3. USB Device, 4. LAN, 5. Borg Interlink Node etc...
You will want to change the order so that USB device reads as number one. Also, a 64GB usb might be a usb3 device, try it in a usb2 port for compatibility.
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