Crashing on startup

My gmod an a few other source games wont start up. I press play game in steam an it opens the “preparing to launch garry’s mod” window and then nothing. I’ve noticed load of other people have had a similar problem but all the fixes that work for them haven’t for me.

things iv tried:

  • Re-installing Gmod
  • Re-installing steam
  • Verifying integrity of game cache
  • Defragment cache files
  • deleting garry’s mod folder
  • Steam support ( who have given up on me )

and a few others i forget

Thx in advance for the help guys :stuck_out_tongue: