Gmod 9.0.4

I've installed it several times and restarted steam as well as my computer and it still doesn't show up in the games list.

What's the problem?

 

Maybe because 9 doesnt work anymore. Not sure but 10 is out and you have to pay for it.

 

have you installed it to the right directory?
c:\program files\steam\steamapps\sourcemods
or
c:\program files\valve\steam\steamapps\sourcemods

and have you got half life 2?

 

yup i do.

 

Tried restarting steam? as in ending the process and reloading it?

 

Yes, i did try that, the weird thing is, i tried deleting it then installing the older version (9.0) and it appeared on the list.