My 2007 MacBook Pro turns on, fans spin, etc.. However, Lines appear on the apple load page and it doesn't progress any further. A box will pop up telling me to restart it, but the screen is full of lines. Any idea on this?
if you're feeling risky, try booting up holding "x". This will force the computer to try to boot, so it should be able to tell you in relatively plain words exactly what is keeping it from booting.
I say risky because I'm not sure if this actually can damage the software on the computer. I used it to diagnose one of my college's iMac's (corrupted boot kernel on that one)