Green screen after suspend

Installed Zorin OS Lite on my Macbook early 2006 (black). So far my experience has been good, however, this problem seems to be unavoidable.

Sometimes when it goes inactive and the system suspend with screen off, I press any button then it goes to the password screen which I put on correctly. After that, it successfully check the password and goes to a green dark screen with the cursor working, the system doesn't wake completely it seems. Hope somebody can help me with this problem, since it annoys me a lot.

English is not my first language so forgive me for any grammar mistakes.

An old thread but wonder if any suggestions here of help?