Issue with Source SDK

I dunno if this is a fuck up or not, whenever I try to start it I go in-game then the SDK closes down with no error.
I tried restarting my computer, no help. Restarted Steam, didn’t work either.
Can any of you guys help me on this? I feel like to do some mapping.

Try deleting your steam\steamapps\username\sourcesdk\ folder?

He told me that he reinstalled it. No avail.

Bump, any answers to my problem?

try deleting both the folder and the sourcesdk.gcf file