If you refer to my notes further up, there are steps that call fro reseating some components, RAM and CPU card etc. Did you perform those? I highly recommend you refer to the service manual when performing the reseat operations as there are other steps surrounding it. You say still nothing but there are other steps that you've not announced as completed, please check all steps. First we need to make sure all steps are performed before someone can help to narrow down to component failure.