All source games crash upon launch without any error messages

[gvazdas]

So any Source Engine game I launch ends up crashing without an error notification.
I tried restarting my PC and Steam and both didn't work.

[MIR]

Did they use to work?

[gvazdas]

[QUOTE=U.S.S.R;29656318]Did they use to work?[/QUOTE]
Well yes, they worked perfectly fine (excluding Garry's Mod), until the newest update of Garry's Mod appeared and it utterly fucked up my source games.

[MIR]

Garry's mod - properties - launch commands - dxlevel 80

If that does not work then ask steam support, although they tend to do more harm then help.

[editline]6th May 2011[/editline]

Or reinstall steam.

[twenty]

Did you verify game integrity?