[all my background is now coming up black? any answers? pls help]

i recently clicked on an object, and now all my backgroung textures are coming up black.

Ive tried clearing my cache, and have gone into prefernces, graphics, but nothing seems to work.any ideas as how to fix this?

pls assist, Caine Haystack

 

 

[why cant i get any sound?]

hi, icant get any sound. any help?