.
(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.
NetFu Firewall 1U, Intel CPU, 8 x Gigabit, SFP, w/ pfSense, Others, NEW OPTIONS
$541.85
Cisco ASA5525-FTD-K9 Security Appliance with FirePower Services
$1000.00
NEW NetFu Firewall Mini, Intel CPU, 6 Port Gigabit, w/ pfSense, others
$336.00
SonicWall TZ300 Power Supply Wired Firewall Router Network Security Appliance
$14.50
Ubiquiti Networks USG Unifi Security Gateway Router/Firewall
$29.95
OPNsense six-port Gigabit router/firewall on Lanner FW-7535 hardware
$69.00
Dell SonicWALL TZ300 | Firewall Security Appliance
$24.99
Fortinet Fortiwifi 60D FG-60D Security Appliance Firewall / VPN w/ AC Adapter
$34.97
Sonicwall TZ350 Network Firewall w/ AC Adapter
$99.99
SonicWall TZ370 Network Security Appliance Firewall (02-SSC-2825)-Open Box
$604.99