Screen saver-part disappeared,part covered with lines

Yesterday l had no problems, but, when opened cover today, l have discovered that my screen saver (lady's face)partially disappeared, other part is covered with horizontal and vertical lines, like some kind of virus. Also, 'switch' button doesn't work - window for the pasword doesn't appear. However, when moving 'switch' button-phrase 'Slide and release the power swich to wake'- but nothing happens when doing so.

What is wrong?