I recently purchased a mindvi to dvi and a converter to vga, I did some research and most sites it should work when you mirror the desktop. But what happens I pick up the projector or even tv, and it allows me to change the resolution of both displays but nothing shows on the projector or tv.

Try going into system preferances and display, check and see if it is recognizing the projector as a second screen.

It does recognize the display and allows me to change the resolution but when I set the Sanyo Dpl and he macbook nothing comes up.