Back a few posts, there was mention of recovery discs etc. Is there any sort of total factory reset ability? Somehow the Z64 i have won't even boot - I started the self-recovery function in Windows 10 (because there was a persistent ghost user account HomeGroupUser$) and I think the power blipped off. Now I just get a blank screen when I power on. Any ideas how to get back to Windows 8.1?? PS I found the boot-F10 option to reset the PC. Trying those options. ---- .... but unfortunately this didn't work. I think the OS is too far gone. is there a hard reset?