When you turn it on, does the screen turn on but remain black? You ought to be able to notice this, because it will still be brighter than it was when it was off. If this does happen, chances are that something did screw up in the firmware, resulting in a brick that can be fixed with a pandora kit. If that doesn't happen, and nothing happens when you try to turn it on, chances are that it's a hardware issue, and will be much harder (read not cost-effective) to fix.