Yeah, I could be wrong but i seem to remember a lot of people were somehow knocking one or both these capacitors off during SX modchip installs and it caused the same symptoms your seeing… though this is from memory only, it might have been at the second bootscreen… i haven’t duplicated this.
It might be your having similar issues to Calvin over on this topic, might be worth first disconnecting battery and power and checking you have continuity at the various points highlighted in my “diagram”. If that’s all good then check the various voltages detailed in Calvins working voltage spreadsheet and ensurig they’re all present… if not report back and I’ll try and help you figure out why.