Chosen Solution
Hello, I tried changing CPU ( i9 9900) and ssd, but after assembling everything, it does not start. I tried searching online what the cause could be, and looking at the diagnostic led i could not find a solution. As you can see from the image there is one led on, and if I understand correctly it is the #2. I tried disassembling again to see if there are some bent pins, but they are all fine. What could be the problem? Thanks
Try reseating the RAM first, then the PRAM before taking it apart again. I had this similar problem.
