After installing Hyper-V function for my Windows 8 x64 and rebooting the computer to install VERY important updates, I sadly found out that the computer restarts when the login screen pops up (sometimes immedietaly, sometimes after 4 seconds). But it restarts like somebody would cut the power - firstly I was even afraid that it's something wrong with my hardware.
I fixed this by booting into safe mode and then disabled all Hyper-V devices (after desperate "imma turn all of these of, it must work" and "I'll re-enable one by one to know what it causes")
My question is, why does it happen (at least to me)? Is there any common known issue and/or solution for this? I didn't even know that so sudden restart is possible because of software failure (well, technicaly virtual devices are software). And I don't want to do tricks just to boot my PC (even if its uptime is about 85%).
And no, there is no track on system log or any log I am possibly aware of. Even with logged boot.