I start out by unplugging everything that can be unplugged. Disconnect everything connected to the disks, pull all the expansion cards, pull the memory, everything. Then see if it tries to boot. If still nothing, try replacing the cheapest part first (power supply). If that doesn't help, all you have left is a motherboard that doesn't work.
If you do get it to try booting, plug one thing in at a time and see when it quits. There's a reasonable chance it will work when you get it all back together (had a bad connection somewhere).
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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