Ok. so i followed instructions on this website

http://www.pspmod.com/forums/psp-har...s-redoing.html

so i started at the beginning and used the files to put my battery into service mode, and it worked. but then i did something very stupid. i turned my psp off!!! (Note that i did not have a mms yet). now my psp wont turn on. the green light turns on but the screen stays black. how do i fix this???? please help