I have now checked with two USB pen drives and both are seen. One is the USB drive I use to flash bios with.
I checked on a motherboard with F2 bios.
Were they both bootable? I'm wondering if the means by which I prepared the drives is causing the BIOS not to detect 'active' status on my USB Flash drives. Or if the problem is simply that my motherboard, for some unknown reason, is unable to boot from USB Flash drives...
Well, I'm going to first try disabling the RAID functionality and see what that does. If that doesn't work, I'll try using Windows to repartition, make active, and reformat my Flash drive. And If even that doesn't work, I'll try downloading the F2 BIOS and see if my problem is just the BIOS version I'm using.