Black meshes

Hi all, Im merely starting Unity now, I have created cube, terrain and imported mesh I have made in other program, but this makes all meshes look like black shapes, terrain looks like white or super lighted white, I managed to see slightly my original textures or anything like Unity default colours using "Render paths" in test mode, but in game mode it remains as said, black shapes and terrain is white, after seeing some videos and tutorials Im sure Im making the right things so is it a fact of configuration or my machine specs are not at the required standards? I have no dedicated 3D card thats why I mention this. Thanks beforehand for any clue to solve this crazyness =)

Edit forgot to mention that my imported mesh looks black in small preview window too just in case it helps, but a friend tested on his machine's Unity and works fine so its properly converted