I'm trying to service a family mac pro and I'm not close at all to an Apple Store. Also, the machine is not under warranty anymore. I think I have a faulty thermal sensor on the northbridge. Its giving 129C readings from a cold boot and I've already cleaned the heatshink and reapplied thermal compound. Running AHT throws an [4SNS/1/40000000: TNOH] error. Resetting the PRAM and NVRAM didn't do anything. I'm not sure if ASD can do any more but its worth a shot right? Does anyone know which version I should look for to use with this 2007 Mac Pro 1.1?