After cleaning inside my mac, I removed the front fan to clean it, my computer didn´t boot, light on, but no chime and black screen, I tried to boot it in several ways and until I removed the memory on the riser b my computer didn´t boot, after resetting smc my mac boot except in the way it was originally located the memory: two pairs of 512 gb at riser a and one pair of 2gb and other 4gb at riser b, but does not reconigze any memory stick at riser b, regardless the card, if any memory stick is seated at dimm 1 on riser b the red light turn on dimm 1, and the apple hardware text showed me this message Apple has detected an error:
4MEM/40/40000001;B:1 C:ºSo$Fox<o8 R:0 if there is no any memory stick seated on dimm 1 at riser b apple hardware test was ok. Now I´m using one pair of 4 gb and other pair of 2 gb on riser a and the riser b empty. I think the logic board is damaged. Thanks
4MEM/40/40000001;B:1 C:ºSo$Fox<o8 R:0 if there is no any memory stick seated on dimm 1 at riser b apple hardware test was ok. Now I´m using one pair of 4 gb and other pair of 2 gb on riser a and the riser b empty. I think the logic board is damaged. Thanks