USB boot from port 1 but not port 2

[Dan]

Booting from port 1 works but not port 2. There are only two ports on the PC. Port 2 does work (tested in linux).

Messages:

Loading EHCI driver
searching on hosts
driver removed
Loading UHCI driver
searching on hosts
host 1
Port 2: device connected
No HD
driver removed
Loading OHCI driver
searching on hosts
driver removed
*** Boot error ***
No boot device found, please retry it