Got this Mac Pro 2013 as-is.
The Mac wouldn't turn on only the ports lights would come on, no power button lights.
After diagnosing with the I/O board LEDs I discovered that on standby (after holding the magnet near the sensor and getting the ports to light up) I get LEDs 2, 3 and 5 and in that state pressing the power button does nothing except turning the lights of the ports on like I would get with the outer case on. However if I hold a magnet near the sensor zone and fidget it at a specific distance, the machine boots but still only the power button lights up, the port LEDs don't.
Once booted it works perfectly fine (as long as i keep a magnet in that exact position). Any idea what could cause this behavior?
Worth noting that i did take it apart to check connections which did not fix my issue and when I went to network recovery I discovered the SSD is dead.
Specs: 12-core, 2x D700, 64GB 1866MHz RAM
Thank you for your time :)