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If you know anyone that can test the power supply with a digital meter, you can check if the power supply works or not. the power control board on the voicestation might have blown. and If that is the case I wouldnt recommending fixing it. Getting a refurbished or used with maybe 3 months to 1 year warranty isnt that expensive on these systems. getting it fix might cost you about the same. But checking if the power supply is working or not would be the first thing you want to do. If that works. looking for a power supply is pretty easy.
First you should check if the power supply is working. You can buy a different one on ebay or if you have a second one you can see if that is the cause. If your power supply says "Spectre" instead of Polycom then it is a good chance that the power supply is at fault. Those weren't so reliable.
Try disconnecting the ISDN module and then cycling the power. If that doesn't work speak to your support provider about repair costs. Ultimately you may need to replace it because of its age (it might be End of Life and not available for repair)