Lenovo K450-----Win 7 ultimate---Up to date.
Used Rufus to create bootable stick. Done,no problems.
Later tried to play audio------No sound.
Windows Sound shows connection to lg tv that I use as screen (many years now ).
Device manager shows no problems.
Checked for Driver problem, Win says up to date.
Desperation, used System Restore to before win defender update this morning ( Holland time ),No change.
What more can I do? I have also tried restarting the pc.No luck.