the infamous Loading bar black screen

So to answer all the questions. I have played g-mod with this comp before i played it last month then took a break for about a… month lol. Now when i start up the game it goes to the loading bar makes it to initializing server side gets to the next thing and then goes black instantly. I can do nothing until the process is ended. I reallllly wanna play again lol having withdrawls so any and all help is appreciated i think the last update may have done it but hey who knows k thank you in advance for all posts towards helping me

[editline]08:14PM[/editline]

update all my steam games except day of defeat hl2 and the episodes so the ones that dont work are
portal,CS:S, TF2 this all started when Killing Floor crashed >.>

new update CS:S came back for a little bit after i restarted my computer couldnt send the the client data and then it began black screening again

Hey hey tf2 still works