Any side of mesh facing down is black HELPPPPP :(

so…the 2 messages i sent have been sent to be reviewed by a moderator lol, no idea, i did say i was fed up and maybe my pc just sucks…i did swear though so maybe thats why lol. anywho, im sorry for wasting your time mate, thank you so much for your help, ill keep messing around with it and maybe figure it out lol