I closed my '07 MacBook the other day without turning it off and came back to it a few hours later. When I opened it it was turned off, and when I powered back up my desktop was back to the original blue setting rather than the picture I had set it at. Now I can navigate through applications through the dock icons, but cannot drag/highlight/or click on the desktop icons. Everything else seems to be working fine, but I cannot access the top bar desktop menu either. Any idea what's going on? Thank you.