None of my Source games will open

Garry's Mod general
#1

Usually they open within 2 seconds of clicking them, but now it just sits on "preparing to launch (source game here) and doesn’t open them. Help?

#2

restart steam

reinstall

or contact steam support

#3

Umm… Are they all completly updated?

Try restarting steam, and if that doesn’t work, restart your computer.

#4

Have they been updated since last night?

#5

.