Ah I'm so sorry to read this. Yes mine just went completely dead.
Ever since I got mine replaced under the RMA procedure all has been fine.
You say you are out of warranty. By how long? Could it be worth still trying on the basis that you understand there may have been a batch of devices with a faulty PoE supplies and that you might have been unlucky enough to have acquired such a device (albeit it did not fail within the warranty period).
At least UK consumer legislation has some notions about 'fit for purpose' and the like, and such provisions can sometimes be relied upon beyond any warranty period. Could there be an equivalent provision in your country?
Otherwise, I hope @bmork can help you here. Perhaps it would be fairly simple to replace the PoE supply in the device. And even such knowledge could come in handy for the future or for others.