Hi there, It's the first time I post here, any help would be apreciated. I have a Mac Pro Early 2009 and since a few days all fans turn at full speed right after the startup chime. I've done SMC and PRAM reset several times with no success. I started AHT and it doesen't even start and throw back the following error: 4SMC/1/1000000: SMC (hope I wrote it right). I could download a copy of ASD and after the test there where several errors: all fan test failed and the sensor tests failed all (voltage and temp) that are located on the processor board (voltage 0 and temp 128c, all the same). SMC 2x2 also failed: SMC PID sensor has tripped. I've cleaned everything inside, reconnected all cables and took out all the RAM boards, left only one of four and suddenly it worked fine, ASD passed also all the tests... After two or three restarts the same issue started again and could not been solved by any try. I think the proccesor board is faulty but don't know if there's any solution. Thanks for your support.