T7910 Unwanted network boot attempt

I can't seem to get my Precision Dell Tower 7910 to boot without user intervention (i.e. key press).

Whenever I set the Integrated NIC setting to "Enabled," the setting reverts to "Enabled w/PXE" upon the next boot attempt. This in turn apparently causes the system to attempt an unwanted network boot, instead of trying to boot from the hard drive from the get go. After the "Invalid partition table!" error on the "Intel Boot Agent GE" screen, if I press a key, it looks like the system boots normally.

I can't find a setting that makes the BIOS use the HDD as the top priority boot device.

I made low resolution copies for some of the boot screens here, but I have high resolution copies if needed.

Thanks in advance!Not using SATA-1, so I disabled it.Using the RAID controller.Boot hangs here until I press a key.Hard drives are clearly the top boot priority.Using Legacy BIOS, not UEFI.Not using any boot security.Changing this setting to "Enabled" seems to have no effect.