Will no longer boot past white screen
OK, so this A 1286 2012 first started to have issues only when cold. Now it does not go beyond white screen, even when it is at normal room temp. I tried the usual SMC and PRAM, at one point it even booted into recovery after the PRAM reset . There I looked in Disc Utilities, and did NOT see the internal HDD represented at all. So I installed a known good SSD drive with Mojave on it ( same OSX as was on the native SSD) and still not going past chime and then white. I can do some very entry level logic board repair, and have the schematics and .brd files and scope, but could use a few pointers, or just one effective one. Anyone? Cheers, Jurgen
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