You could gain greater insight into what is occurring at camera boot by monitoring the boot log that comes out of the Serial engineering port on the camera. You should see the progress of the boot and where it halts due to a problem.
Make sure that the SD Card is suitable for the role and not a higher capacity than the camera can handle or containing the wrong format.
Fraser
yes I tried in vain to find any sort of serial debug activity on the 3 pin headers on the board but all those pins are silent. I am 100% the debug info flows if either one pin is pulled low or perhaps a certain character is typed into the RX line (wherever that is) to enter the bootloader
I had a similar experience with another instrument using a LogicPD CPU board that only when you typed in a certain letter quickly at the start then it would stop the boot and take you to the bootloader otherwise there was no activity. However the good thing was that I was able to find the datasheet of that LogicPD CPU boad and trace its UART pins to a header on the board. Here in this camera unfortunately the LogicPD board is very very old and there is no mention of it anywhere let alone its datasheet...so I cannot know where the serial port might be
However, I have confirmed that there is activity going on all SDRAM memories so it is not dead or in reset...so something is happening but ....
EDIT: by the way the main board and the LogicPD CPU card in this unit looks identical to what was posted earlier in this thread from a Ti45 (or was it TiR3?)
anyways, they look exactly the same with same numbers on the parts.