While trying to upgrade my PSP to a custom firmware, after I had downgraded it to a 1.50, I ran into a few errors, and well, now I can't turn my PSP on, when I try to, the green light comes on, but after a few seconds, it goes off again, my friend says its fixable if it does that, but the memory stick light doesn't come on either, anyone know for sure if its fixable or not? And if it is, how can I fix it?