This is not a particularly general tip or post, but Toni and I have been stuck with it for a few hours (day and 1/2, on and off).
Wifislax is this great auditing linux distro you can install and run from your usb.
But you have to know that even when burning it with either unetbootin or dd, the usb drive is not bootable. Don't know why, but it's not.
You have to mount the drive, and run a file called /boot/bootinst.sh .
Stupid, yes. But it took us hours to find out. It took more time to burn the iso than to do the actual 'auditing' job.