Loading issue.

Ok i just downloaded Garry’s Mod but when i open it and it starts t load it stops at “post init system” and just will not load anymore anyone know how to fix this issue?

First try google, secondly check Garrysmod.com for any info, thirdly verify the integrity of the game cache, last suggestion, right click Garrys mod in steam, go to properties and set launch options to “-dxlevel 81”