This is the second mackintosh I have just build, I didn't figure out how to display as your profile:
"Haswell: Gigabyte GA-Z87X-OC | i7-4770K | Asus Strix GzeForce GTX 970
Lynnfield: MSI MS-7658 | i7-870 | ATI Radeon HD 5670z'
Luck you, I have a GA-H81M-H with i7-4790K CPU. G210 1G display card.
For sierra, I cannot have multibeast installed at all.
Mutibeast will stop the internet, which works with USB boot (unibeast).
Other than that the sound is not working at all. Display works, but no full feature.
Exactly the same happened to me today on a Gigabyte GA-H81-H.
What I have done is: disconnect the power supply, remove the BIOS battery, and short the two pins for clearing the BIOS for couple of minutes. Eventually, the mother board is back.
I was thinking I may need get a tool to...
For some reason, i have tons of issue with multibeast.
1. It cannot boot from hard drive.
2. no sound, and the display card was not working fully.
3. After multibeast, no internet. And it was working before multibeast.
After have two machines build, I have found that build a UEFI based motherboard is a lot faster than Dell optiplex 780. It seemed the Dell optiplex 780 motherboard BIOS may be changed for no reason. Don't understand why?