Tell us what custom firmware and what popsloader version you are using and it would also help if you tell us where you installed the popsloader files on your memory stick (It won't work if you don't place the right files in the correct folder). Have you put the prx files in your seplugins folder? Also when the screen goes black, what happens afterwards? Does your PSP turn off automatically or does it go back to XMB with an error? If you're getting and error, what is it?