Hi guys, I'm having a bit of a problem with my Macbook. Once the display goes to sleep, I can't seem to get the screen to come back. The computer doesn't actually turn off, but when I try to get it back with my mouse it goes black. I can usually still slightly see my applications and stuff, and the fan still runs. I end up having to shut it down and then restart it every time. Just wondering if anybody knows how to fix this. Thanks in advance!