In cases where I see this it's one of two things.
1. The BIOS is buggy. This is a common bug to many InSyde BIOSes.
2. The BIOS is set to try USB booting and fails.
There is only one cure to item 1 and I bet you know what it is.
The pc will just hang at splash screen SuperMicroTM X10DAC when I have USB attatch so I have to unplug all of the USB expect the unraid boot drive every time I boot
USB Drive list
1. Unraid Boot drive
2.razer black widow chroma v2
3.logitech wireless mouse
4.HP mouse and keyboard
5.Webcam
6.dlink wireless adapter
Also the system is running 16 vm 2 is hybrids so I need 2 mouse and keyboard and the mb bios is up to date

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic