This is sorta urgent, since my dad's whole business relies on his computer, and it needs to be fixed. Anyway, it will startup and and make the mac "on" chime. But after that, nothing happens. We can tell it is on because pressing the caps lock key will turn the capslock light on and off, and the black screen is still brighter than the bezel. We tried doing a PRAM reset, and that didn't work at all. We still have yet to start in Safe Mode, but again, this is my dad's whole business at stake, so if you or you know someone who can help, that would be great.
EDIT: We just tried booting it in safe mode, and nothing happened. (Maybe it is the logic board. If it is, could someone confirm that so we don't waste any more time trying different solutions?)