Try not using a PSU, and set JUMPER to EXT. plug it directly into the CPC464 using the edge cable from Toto.
Does blue light come on?
If blue light goes on, clean the expansion port x 10 (IPA)
- It's so far always been the problem when there was one
If the blue light does not come on when jumper is at EXT and connected to the CPC464, it sounds like something has gone wrong with board, although I do run some longer tests on each board before shipping. Then send it back so I can fix it or send you a new one.
Not using a PSU, and having jumper at EXT was the first approach. No LEDs comes on. I suspected shipping might have done something to it.
But using USB wire while jumper is a USB does light up a few LEDs, so now I'm guessing the board works and my expansion port is to blame.
So then I tried PSU + jumper at EXT, but no LEDs still.
TotO also sent a cable for my CPCplus, so I can try that one, but won't have time before next weekend.
I do also have another CPC464 somewhere that I might try earlier.... actually I do have a few minutes right about now, so lemme see if I can find it.