This morning I found our server HP Proliant ML310 G5 dead. There was only front led number 4 with amber light - which stands for "AC power in stand by mode". The server cannot start now. What I tried:
1. Removing the motherboard battery
2. Reseating everything
3. Tried starting the server with no controllers or devices connected.
After all that - the server seems to starts, all lights green - but nothing on the monitor it is just staying like that.