Dual monitors with HDMI Splitter

I am wanting to use my ATV 2 at work to run a slideshow on 2 monitors. I bought an HDMI Splitter but it just has a black screen. If I hook up 1 HDMI it works fine. Any ideas?

It sounds like you are trying to use a passive splitter, which means when two displays are connected at the same time the Apple TV will be trying to talk to two devices at once causing corruption. You might try powering on one device at a time but my suspicion is it still won't work and even if it does you may well experience a degraded signal.
You probably require a multiplexer which is somewhat more expensive.

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