Plot function evaluation fails

I have a problem visualizing my plots. Example when I evaluate the following expression:

In[1]= Plot[Sin[x], {x, 0, 6 Pi}]

the outout shows that

Out[1]= -Graphics-

does any one can help ?

Raspberry Pi or Kernel?

what setting do I have to make then?

Try the next

Plot[Sin[x],{x,0,6 Pi}]

Greetings Anis Faidi

the syntax is correct, this happens even when I evaluate the help plot examples.
so, it is not related to expression syntax but probably to some system setting or missing programs

Maybe check the setting mentioned in support.wolfram.com/kb/3590.

Thnaks Ilian, it helped a lot

Most probably you are working on Mathematica Kernel version 6 or higher. Actually I am facing the same problem, it is perhaps because the Kernel doesnot display graphics. For graphics in kernel, you need to instruct the kernel to open >>JavaGraphics` , but in all the latest version this fails.