I'll try to explain as much as I can:
Found a PSP, it turns on the but the screen is black. The power indicator is solid orange though, and it doesn't turn green when I turn it "on". Sometimes it flickers between green and orange intermittently and then goes back to solid orange. I got my Pandora and MMS and managed to get it into recovery mode, which was a step up from what it was doing (nothing).
This let me know that the screen was fine and that at least the mobo was OK. I proceed to install 5.00 M33 from my MMS, everything goes peachy. Put back in the normal battery and the same thing happens, solid orange indicator and black screen.
Frustrated I decide to put on the OFW through the MMS, same problem. I don't know what to do at this point. The recovery menu comes up perfectly but if you attempt to go into the configuration menu for the CFW OR the normal XMB the screen stays black.