it sounds like a brick so yes a magic ms and pandora might help u
lol it's sorta like that lobo, he has a memorystick that has not had the boot files applied yet, so when you try to boot with a pandora battery it has nothing to load off of, however if you tried to boot from ac (normal battery/non pandorized) it will boot like normal, I'm pretty suprised he didn't know this, pretty silly mistake, it's a pretty known user rule for CFW users, you can't boot a PSP with pandora, unless you have a mmc, regardless if you are unbricking, or already have firmware installed.
Your friend has done absolutely nothing to the PSP. Get a mmc, or normal battery, plain and simple.