In Shenzhen I talked to someone who was struggling the same problem we struggled a long time in Fab Lab Polytech.
As I understood the problem is rather widespread. It is about the burning out of IC (EFEB 8918 3430 U31) on Epilog’s motherboard because of power instability (we use voltage regulator though).
Epilog just doesn’t boot, however coolers are working.
The issue is that the service costs 2400$ and it is absolutely impossible for us. So after some tweaking of our broken Epilog and it’s motherboard we managed to fully fix it with a less than $100 budget. If some one has the same issue as we had- just reply me here and we will prepare and send fixing manual for you with the links to needed components.
Of course you will do this at your own risk…