Hi [NAME],   For SC1435, pressing the "i" button would just blink the blue identification, it is only for identifying. Could you try press and hold the same "i" button to check if there is any indication of error code.    Try removing all the components of the server except for these below. Then try turning on the server.  If the steps above fails, unfortunately, there is nothing much I can think of to try on any steps to revive the server.  
Hello all, I have a dell poweredge sc1435. Ik, it’s a dinosaur but I have a problem with it. It won’t turn on and flashes a blue light when I press the “i”. Also the aux_per light on the motherboard is on so I know that there is power running to it. Anyone have any ideas?
Sc1435 flashing blue light and not turning on