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Indeed, the others have nailed it - good advice. You've got more bit depth than what photoshop is expecting hence the 16bit image will initially look black with perhaps a few bright stars presented as dim point sources. As Marc suggests, you can do a DDP stretch and log stretch to fill the bit space prior to opening it up in photoshop, but this is nothing some levels and curves can resolve if you don't want to do any prior stretching. Also, note that while with 16bit data, you've theoretically got 65k levels of brightness, photoshop summarises this from 0 black to 255 white (similar to an 8bit space).
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