.
(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.
1U BareMetal pfsense opnsense Router Firewall DNS Server 6x 10GB Ethernet Ports
$149.00
PFSENSE 15" Depth Server Router Firewall Supermicro X11SSH-F E3-1240 V5 32GB RAM
$382.00
1U Open Source Router Firewall X10SLH-N6-ST031 E3-1270 V3 6x 10GB Ethernet 16GB
$419.00
Dell PowerEdge R730xd Server 2.60Ghz 32-Core 64GB 800GB SSD Debian Linux
$836.80
Open Eye OE-MTX08 8TB Micro Server With Linux (Boots To Login) No Accessories
$294.95
$5.49
Red Hat Enterprise Linux 5 Server - New and Sealed
$16.99
IBM CS821 20-Core 2.827GHz 128Gb 1.92Tb SSD 1U Linux Server - 8005-12N Power 8
$599.95
VPS Windows / Linux Server - 12GB RAM, 4 Core, 1 TB HD, Unltd. bandwidth 1 Year
$277.62
8x 240GB SSD 1U Rackmount Deduplication Compression Backup RAID Server X10DRW-iT
$499.00