[Jelkan]

Hi,
So every time i try to launch Gmod or Css i get a black screen and have to restart my computer with the power button
it just stops responding, cant do anything, no taskmanager cant even change capslock or anything

I got Windows 7 Ultimate 64bit

css and gmod worked when i had Win7 32bit, computer spec hasnt changed except that i can now utilize my 8GB of RAM

anyone know whats causing this?
_____________________________________________

Things i've Tried

Running in Compatibility mode
Both running Steam.exe as Winxp and Run as Admin
and the .exe for css and gmod as winxp and Run as Admin
Screaming at pc
Google

[Jelkan]

got the black screen pc crash solved, now css is working normaly
but gmod just instant crashes when i try to launch it only see a black screen and it goes down

i tried running in diffrent "-dxlevel" but that didnt do anything

[Jelkan]

some updates:
Garrys mod 13 Beta works just fine
running garrys mod with -Width and -Height didnt work
reinstalling gmod again didnt work
tried Debugview, forgot that it doesnt work for me anymore
Turned off Antivirus program "Avast"
Defrag of game Cache in steam
Verify integrity of game content

none of theese worked

[Jelkan]

no one knows whats wrong?