I have exactly the same issues here on a Gigabyte GA-Z87MX-DH3, a bit strange indeed. I have tried turn every knob there is in the bios menu. :-)
2014-04-29 21:18 GMT+02:00 Martijn Rijkeboer <mart...@bunix.org>: > >> I've installed OpenBSD-current AMD64 on my new computer without > problems, > >> but as soon as I reboot the system, it freezes in the post. The only > way to > >> go past the post is wiping the first few megabytes of the harddisk using > >> another computer and than start again. After installing I can't even > >> enter the bios setup. > > >> The system contains the following components: > >> - Motherboard: Gigabyte GA-B85M-DS3H > >> - CPU: Intel Core i3 4130T > >> - Memory: Kingston ValueRAM 8 GB DDR3-1600 Kit > > >> I've configured the bios the following way: > >> - Windows 8 Features: "Other OS" > >> - Boot Mode Selection: "Legacy Only" > >> - VGA Support: "Auto" (Enables legacy option) > > > I'm not familiar with the particular motherboard, but I had success > > with other Gigabyte models. > > > Find the option "CSM Support" in the bios and set it to "Always", leave > > "Boot Mode Selection" and "Storage Boot Option Control" to "Legacy > > Only", power down the system and then try booting OpenBSD. > > Unfortunately that doesn't work either. The strange thing is that if I > remove > the harddisk and use an USB stick I can install OpenBSD on it and boot it > without problems. > > When I place the harddisk back with only an OpenBSD fdisk partition (A6) I > can > still boot from the USB stick, but once I place a disklabel on the > harddisk I > can't boot anymore (the system freezes on reboot). Apparently the bios > can't > handle the disklabel... > > Kind regards, > > > Martijn Rijkeboer