How to set up a 3-screen video installation to sync correctly? I need to set up a three-screen HD video installation with sound for a friend's art exhibition. The videos will likely be provided as separate video files, each with a different video but exactly the same length and intended to be played synchronously. I'm looking for advice on how to set up the installation so that the three screens will be synchronised correctly and played on an endless loop. What's the best way to achieve this with consumer-grade equipment?

I can hopefully borrow three HD (720p) projectors - not sure yet which model, I'll hopefully find that out soon - or can possibly purchase three cheaper projectors specifically for this. I've been told it's important to have the same model (&amp; year?) to ensure the color will be effectively matched.

I can borrow a laptop or mac mini to drive the video or could purchase one or more cheap devices if needed. I can also borrow blu-ray players if that's any use. Again, I need advice about what device to borrow/buy.

Sound is two-track stereo, so can be played from just one of the videos. That should be the easy bit.
The Matrox graphics card is probably the easiest and most versatile approach. I use the TripleHead2Go, which as you'd assume sends a signal(s) to up to three monitors/projectors.

Multiple computers will never stay in sync. I found this out the hard way the night of an event.

In terms of software, if you're on OS X check out VDMX. There's a fully functional demo that you can grab. Setting it up for your needs would be fairly trivial after a quick search for the right approach.

PS. I would have just commented on the other answers, but I'm new here and don't have the credentials.