A1342 820-2567-A brain dead

[cruiser_]

hi everyone,

i've got this ancient board here, repairing it as an exercise really. it seems to be brain dead.

upon triggering start via SMC_ONOFF the fan starts to spin, USB powers up, CPU gets hot but there is no further activity.
nothing on the video output, no USB activity (using pendrive with an LED).

I've read the bios, it looked ok, valid checksums, model/.mb match etc.
I cleared VSS and wrote the bios back. NO change.

any suggestion as to what might be the cause of this?

[cruiser_]

CPU and MCP seem to be starting all right...

[reformatt]

Look for variation in input current to see if it's loading bios etc. I'd be looking at ram or the slots if it isn't.

[cruiser_]

off to SMC current looks like this:
https://youtu.be/IlshUsefxzg

green light to full start:
https://youtu.be/YG3foWJHHAM

unfortunately I have no similar board to compare. does this look ok?

there is activity on SPI, but I guess that could come from SMC and not CPU?