You can power up the board just fine without that heatsink but *do not* move any stepper motors until you get that heatsink properly reattached with thermal adhesive. Do not use normal glues, don't get thermal paste. It must be "thermal adhesive". You can't get this at bestbuy but you can get it at some walmarts I think:
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illuminarti 18
Looks like its a heat sink on one of the stepper drivers. If the board itself wasn't damaged, you could maybe reattach the heatsink, for instance as discussed http://forums.reprap.org/read.php?13,67280,67324.
But I'd be inclined to first contact UM support, and see what they say.
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