Hey guys, I have a 2007 MacBook Pro. I usually leave it to sleep when I don't use it. Today morning, I opened the lid, and I heard the noise when it wakes up, but the screen stays blank. Here are the troubleshooting I did: 1) I powered it off & on, screen is blank. 2) I powerd it off, pulled the battery, powered it on, screen is blank. 3) I powered it off, connected it to an external monitor using a DVI cable, powered the notebook on, MBP Display stays blank. The external monitor says "no signal". Any idea?