.
(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.
Dell PowerEdge R720 Server - 2x8c CPU,256Gb RAM, 128Gb SSD/3x600Gb SAS, Proxmox
$360.00
Dell PowerEdge R620 Server 2x E5-2660 v1 2.2GHz 16 Cores 256GB RAM 1x 300GB HDD
$89.99
Dell PowerEdge R720XD Xeon E5-2680 V2 2.8GHz 20 Cores 256GB RAM 12x4TB
$510.00
Dell PowerEdge R730XD 28 Core Server 2X Xeon E5-2680 V4 H730 128GB RAM No HDD
$389.99
Dell PowerEdge R730, 2 sinks, SystemBoard, 8 trays,H330,Idrac 8 exp, 2x750w Psu
$135.00
Dell PowerEdge T330 E3-1240v5 3.5GHz 3.5" 8-Bay 8GB PERC H330 Server Tower
$200.00
DELL POWEREDGE T430 SERVER W/ DUAL XEON E5-2609 CPU & 16GB MEMORY
$329.00
28 Cores Server 2GHz 96GB DDR Dell PowerEdge R730 H730 Raid Dual Port 1Gb RJ45
$418.00
DELL PowerEdge R630 8SFF Server 2x E5-2680v3 2.5GHz =24 Cores 32GB H730 4xRJ45
$240.00
Dell Poweredge R730xd 2.5in 2x E5-2690 v3 2.6ghz 24-Cores 64gb H730 2x 750w
$189.99