Yeah did it too now, with my mother's usb stick 
Turns out the drive needs to be formatted and really in FAT32, not the FAT vista displayed on my other usb stick.
EDIT: now that I'm on the F4 bios, my rig has started making periodic sounds which sond like soft beeps. It seems to be coming from the motherboard :/

Turns out the drive needs to be formatted and really in FAT32, not the FAT vista displayed on my other usb stick.
EDIT: now that I'm on the F4 bios, my rig has started making periodic sounds which sond like soft beeps. It seems to be coming from the motherboard :/