Update: October 17, 2016 Sorry guys - not much to report yet.
I've been kind of busy dealing with other stuff and haven't had time to swap Motherboards in the replacement system.
I have a suspicion that the other MB, which came out of that case originally is toast anyway - it is one of two computers that were given to me by a friend after she upgraded due to a lightning strike.
I've been watching Craigslist for a suitable LGA775 replacement MB, but nothing has shown up yet. Maybe next week when the pension check shows up...
I have however been doing some more research into a new MB, CPU, and DDR4 RAM to build a new system with. Here are the links:
Motherboard - GA-Z170X-GAMING 7 -
http://www.ncix.com/detail/gigabyte-z170x-gaming-7-lga-43-113385.htmCPU - BX80662G4500 -
http://www.ncix.com/detail/intel-pentium-processor-g4500-3m-c6-116973.htmDDR4 RAM - F4-2400C15D-8GVR -
http://www.ncix.com/detail/g-skill-ripjaws-v-8gb-2x4gb-8d-111404.htm The MB is a pretty good one and priced at $240, I'm thinking that this will be a good base for my new system. The CPU and RAM are the cheapest I can find with the idea of getting a working system as quickly as possible. As it is fairly quick and easy to replace the CPU and the RAM, I can upgrade these items later as budget allows. Total cost would be about $460 including all taxes.
While it would be great to plug an i7 CPU into this board, the G4500 sells for only $94 while an i7-6700K runs $450. I'm just hoping it will be enough that I can get back to video editing. At least it should be stable.