Introduction
The power button on this device has a tenancy to break. This guide explains an easy fix.
Tools
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            Power down the Synology. 
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            Since the power button no longer works you can go to the web interface [https://IP_address:5001], log in and select shutdown from the menu in the top right. 
 
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            Remove two screws from the back. 
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            Make sure to put these screws where you can find them, mine are long gone! 
 
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            As you can see the plastic of the power button has broken of. 
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            I considered replacing the button but fabricobbled an easier fix. 
 
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            Remove the gray front with 3 screws for easier access. 
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            Cut a bit of thin plastic to the right dimensions. (About 3 x 1 mm) 
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            Superglue the thin plastic on the cross of the power button. 
 
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To reassemble your device, follow these instructions in reverse order.