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I just setup a new PC with the new ASUS P8Z77-V PRO/THUNDERBOLT and am currently able to get one of my two thunderbolt displays working. The second one is outputting sound, but no video...

Any ideas?

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If this question's accepted answer is correct, you should be able to use two displays with up to 1920x1200 pixels, or one with 2560x1440/1600 –  Daniel Beck Jul 26 '12 at 8:41
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Are you daisy chaining your displays from that single Thunderbolt port? I don't think that will work.

Only Macs with dedicated graphics are known to be able to drive two thunderbolt displays on one cable. The on-board Intel graphics may not even be able to output that many pixels. (The spec says - Supports Thunderbolt with max. resolution 2560 x 1600 @ 60 Hz)There's also the protocol problem of sending two streams on one cable.

You'd better connect your second monitor via another port.

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Asus website: Data transfer rate up to 10 Gbps; Daisy-chain up to 6 Thunderbolt devices –  Daniel Beck Jul 26 '12 at 8:39
    
But the monitor is based on the display port protocol, not the PCI-E protocol.... Some Thunderbolt-enabled Macs don't even allow you to daisy chain monitors. –  billc.cn Jul 26 '12 at 10:53
    
@billc.cn which is the confusing piece... I'm contacting their "support" today to see if they can provide any final answers. –  RSolberg Jul 26 '12 at 14:47
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