Wow, many thanks for all the responses, suggestions, and help! There is a bunch of good information in this thread.
In short, I tried all the "easy" troubleshooting things, i.e. power supply, reseat cards, etc. Nothing worked, and every minute the machine was down, I was not making money.
As suggested here, I went and got a new MB and 64M DOM. Got them from EMI. No, it was not cheap. BUT Mark at EMI was extremely helpful, patient and knowledgeable. I had the stuff the next day. For a chip sweeper like myself, it was a bit intimidating pulling out all these cards and wires and such, but I went real slow and kept track of where everything went. At the end of the day, I figured almost 10 years on a MB, not a bad idea to replace anyways...I mean, I put new timing belts in my truck before the break, right? I am now budgeting for a new MB and memory every few years, as long as I can get them.
So far it is running great after a few days and I'm breathing a huge sigh of relief for now. As you know it is very different owning a machine to make a living vs. one for fun. It was a very stressful time, esp. due to my remote location, and I am truly grateful for all the help posted here. Machinetek, NC Cams and the rest, you are great resources to the community!
Couple other things I learned, that may be of help to others.
When I bought the machine, it had a Fram air filter on it, with the model # written on the cabinet. So that's what I bought and used on the machine. Turns out this is completely the wrong type filter, even though it fits. The real Bridgeport part has a lot less air resistance than the auto filters, allowing greater airflow to the cabinet. I switched filters and the difference was dramatic. Pains me to think for several years, the electronics weren't getting the cooling they needed. Thankfully I work in a very cool environment.
Write down all those settings/parameters! I hadn't bothered, so I had no idea what my CMOS etc. settings were to begin with. I went and took pictures of all those screens for the future. From the main menu, *11235 gets you to the parameters.  |