I don't quite understand this, I dont know if it's to do with my ISOs, or what, I've downloaded a few they come in a pack, .rar files. i extract them and theres a .iso, so i put the .iso in to the ISO folder of my psp. But when i go to load it though devhook, I do everything right, then press 'start devhook' reboots as it normally should, then I just get a blank screen. and it doesnt reload. What could be my problem?