3476 freezing

Rford

New member
Have a 3476 that chimes on startup, has fan etc. checked all components and traces around u7100, but it either crashes on start up(sometimes), or freezes(mostly) with the apple logo and an empty progress bar. If I change the SSD, it boots but very slowly and then goes right to recovery. If I plug in my external drive via USB it freezes too (known working external drive). Ideas where to go from here?
 
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