[gunsmoke]

Well it hapened to me once , but then i restarted the SLim , and it worked again.
If you didnt try , make a hard reset , hold the On button for 3 or more seconds , then power it on , to see if still stays the same ... sorry i cant help more.

Edit : To be exact after i play some backup , after then press home , go to XMB , then off and back on , and the PSP stays Black Screen , then i Reset the PSP and it got fixed ...

what i use : screen capture plugin ; NO_umd33 or Np9660 ; Cpu 333 all ...