u/Environmental_Use521

Hey everybody, as the title suggest, i am preparing to sell this old pc, so in windows i went to the settings and chose to reset the pc and delete all its files. it asked me to restart, and it did. then the pc was on for 2 hours, with black screen but the pc was running, i thought it was hung, so i force shut it down.. now when i turn it on again, same problem, screen is black and pc is running, all fans, green light in the front blinking as it the pc is "processing" .. I tried to reset the CMOS battery already, push the reset button, removed and put back the graphic card and all the RAMS.. still no difference at all...
my hunch is that smthng went wrong relating to the reseting process. any body knows how to override a broken one?
Many thanks!