Hi--my new Vivitek D5 projector is not connecting to my Macbook. I have a mini DVI converter attached to a vga to DVI video adapter, but the projector can't "find" the source.

you'll need the appropriate adapter from the video out on your macbook to whatever input on your projector.

For instance, I use a mini-dvi to VGA adapter and VGA cable into my projector.

Try to connect your Mac Mini to another DVI-capable monitor. May be your DVI out on Mini doesn't function at all

You should be able to use a USB - 4 pin mini-DIN cable with this projector.

You will need a Mini-DVI to VGA adapter. Apple sells this item through their online store.
http://store.apple.com/us/product/M9320G/A?mco=MTY3ODQ5OTY
You will also need a male to male VGA cable to attach the adapter to the projector.
You can find modestly priced cables at monoprice or other retailers. example: http://www.monoprice.com/products/product.asp?c_id=102&cp_id=10201&cs_id=1020102&p_id=2898&seq=1&format=2
Plug the cable into your projector and then plug the adapter into your MacBook. The MacBook will automatically resize your picture to the appropriate resolution for the projector.
Enjoy!

what are your options on the projector side?
Your Mac comes with a DVI (Digital Visual Interface) port.
Attach the DVI to VGA adapter to the VGA connector of the external monitor.

depending on the external monitor/projector, you may need different adapters.

You may need a certain connection (MiniDisplay Port to DVI, or MiniDisplay Port to VGA). If you're connecting to an HDMI-compatible projector, you'll need an adapter. You'll also need an adapter if connecting your MDP (MiniDisplay Port) to a DVI or VGA port. Here are some helpful links:
#1 MDP Adapter Video (YouTube)
#2 MDP to HDMI Adapter (RadioShack)
#3 MDP to VGA Adapter (Apple Store)
#4 MDP to DVI Adapter (Apple Store)

http://www.radioshack.com/product/index.jsp?productId=3898890&CAWELAID=447271885

http://store.apple.com/us/product/MB572Z/A

http://store.apple.com/us/product/MB570Z/A

Are you asking if there is an adapter? There actually is an adapter (USB to S-Video) that will work between the two. However, with my MacBook C2D 2.4 GHZ, I use mini DVI to VGA adapter. This allows instant laptop to projector picture and sound. You can use it for anything from powerpoint to movies or even as a giant monitor. The mini-DVI to VGA adapter can be purchased at Best Buy for less than $20. Look for it in the accessory aisle near the Apple machines. IMO, this is a priceless addition to your MacBook. I hope this helps! Please remember to vote if it does.

For these types of projectors if you're planning to hook it up using you MacBook ;

You will need a converter ( from VGA to DVI )
Using the VGA cable that came with the unit when purchased ;

Connect the VGA cable on the back of the Projector and on the other of the cable you will connect the converter ( VGA TO DVI ) since for MAC systems it has DVI ports for monitors not VGA...

You can purchase the converter at any Mac store or any computer shop near you..

Macbooks are equipped with a mini-dvi port this is what you will utilize to send a video signal to your projector first thing you need to figure out is what input is on you projector either it is dvi or vga then go to best buy and get a mini dvi to vga adapter it is only for macs let me know how it comes out

You will need to have a dvi to vga converter. If you have a Macbook, it is a mini dvi to vga. You can get this adapter direct from Apple for about $20. A wireless connection is not available with this model projector.