ipxe on usb

[ab_ipxe]

I tried using dd if=<path>/ipxe.usb of=/dev/sdb1 (sdb1 being my usb device)
when I tried booting from it, I ended up with a black screen with the cursor blinking indefinitely.
What am I doing wrong?

*gparted still shows the usb flash as fat32.

(2013-06-14 08:25)robinsmidsrod Wrote:  Running ls -l /dev/disk/by-id should list the disks recognized on the system. Ignore all the -part files (they represent partitions, not whole disks). Then you do the following to write the image out: dd if=path/to/ipxe.usb of=/dev/disk/by-id/my-usb-stick-name (replace with what you found above in the output from ls -l)

Be careful not to overwrite the wrong device, or you'll need to recover its contents from a backup.