The landing lights in fs/9 are visible on the outside of the plane but not from the inside.I had installed a A-330 panel with 2 modules FSSound.dll and gps_export.DLL when i ran fs-9 it said that they were not compatible so i removed them could this be the problem,How do i get the lights back on from the cockpit!!!

I had exactly the same problem in FS 2002. I don't know if this fix will be applicable to you, but may well be worth the try.What fixed it for me was to remove the FS2002.cfg file. I deleted it, but in your case you may want to move it to a safe place.Then I started the program, and allowed it to build a new one.Since then I have had no problems with the lights showing from the inside.Note: Doing this will reset the sim, so you will have to redo all the customizations that you have made.Goodluck