Flash that version that makes the PC boot. Or try Ubuntu, usually linux isn't picky about modified BIOSs and lets it boot.
The PC boots only with the default BIOS and I'm mining only with Ubuntu. I've downloaded Windows 10, GPU-Z and Furmark only because of this faulty GPU and at 100% load because of Furmark the engine clocks @501 and mem @1400. The GPU ignores every command through MSI Afterburner and aticonfig in Ubuntu above 501 MHz. I'll return the 7970 as soon as possible. In the meantime I'm mining @400 MHz with 10 MHs
