Guys no sound plays on my pc.
For no reason. Literally!
Help!
Anyhow: I mock you because hopefully my accurate recreation of your post shows how vague and useless your own is. If we are to have any chance of helping you solve your problem you will need to provide far more information about what it is you're having problems with. What program you're running, what you've done to get to where you are, what you
do currently see. As penguin and yyler say, screenshots will help us diagnose problems almost instantly if it's a semi-common issue.
So you say you made a block:
Is your camera inside the block? - Look up the navigation controls to move outside of the 'brush' (that's what a 'block' is called)
https://developer.valvesoftware.com/wiki/SDK_Docs
Is your view set to wireframe? - in the top left of each view there's a little drop down to select the render method, select 'textured shaded polygons'
Did you actually create the brush yet? - A brush won't render before it's created but the bounding box will appear.
I am stabbing in the dark here, to be able to correctly diagnose your issue I would need a better description of what you've done and/or some screenshots.