Team fortress 2 validating steam files mac
In this case your video card is incompatible with the game.
It is advised to uninstall those programs and try to launch the game again.
If uninstalling is not an option, temporarily disable or exit the software before starting playing.
You could also try temporarily disabling any antivirus software you might have installed, as they may conflict with the game.
If when you start Garry's Mod the screen is black - your display settings might be wrong.
Chris' FPS Configs for TF2 - Different configuration files to automatically set all settings to their absolute lowest or highest.
It is recommended to troubleshoot before resorting to these as they can cause problems.
It is possible to increase the FOV limit up to 130 using server-side plugins such as this one.However it is important to note that, while allowed by the ETF2l, client-side plugins are not officially supported by Valve and may be classified as a cheat so use at your own risk.