.
(specifically, HP's Pavilion P6-2310)
Excerpted from http://distrowatch.com/weekly.php?issue=20121126#news
Boot machine while pressing F10
Find Secure Boot in the menu tree, ignore warnings
Disable Secure Boot feature
Enable legacy boot options
Enable specific legacy devices, such as USB devices
Save and reboot while holding down F9
If this doesn't work for your device, refer to Jesse Smith's article for clues.
Also, post your solution if some other scheme works for you.
Cisco SG110 8 Port Gigabit Ethernet Switch SG110D-08-UK
$39.00
Cisco SG110 24 Port Gigabit Ethernet Switch w/ 2 x SFP SG110-24
$117.00
8 Ports Unmanaged Industrial Ethernet Switch Network Gigabit Ethernet Switch
$76.50
New Linksys SE3005 5-port Gigabit Ethernet Switch
$18.99
Juniper Networks EX3300-48P 48-Port PoE+ 4x SFP+ Network Switch w/ Power Cord
$43.95
New 10/100 Mbps 8 Ports Fast Ethernet LAN Desktop RJ45 Network Switch Hub
$11.49
Ubiquiti Networks (USW-Flex-Mini) 5 Port Standalone Ethernet Switch
$35.00
Netgear ProSafe S3300-52X-POE+ 48-Port Gigabit PoE+ Stackable Network Switch
$100.95
Fortinet FortiSwitch FS-124D-POE 24 Port Gigabit Ethernet Switch UNREGISTERED
$99.97