My mac won't start up (working fine yesterday). I hear the fans running when I turn it on but that's it and the screen stays black. Any idea what it might be? It's 10.5.8 (bought it in 2008 before the newer ones came out) if that matters. Also, if there is nothing that can be done, is it possible to get my data off it somehow? I haven't backed up recently and I really need that data. Thank you!