My first guess would be a corrupt .db file caused by the system power loss. Please:
1) send us the current node logs. run forever list to see the log file name and location (under forever folder) then send Boris or me that file.
2) stop the node - forever stop 0 (or sudo forever stop 0 if you run the node using administrative rights)
3) delete the blockchain.db file - rm blockchain.db
4) start the node - forever start app.js (or sudo forever start app.js if you run the node using administrative rights)
Allow some time for the node to download the blockchain.
Please let us know if this solved your problem
Hello and thanks for the solution!
I'm currently downloading again the blockchain.db but it's a pretty slow process... I will update when finished