I've found multiple accounts and it was a different solution for each individual, which is why I'm so wary. =/ Two pinpointed the PSU to success, one pinpointed the CPU, one (now two, with you) pinpointed the GPU. Some got lucky and discovered it was the RAM. Honestly it looks like the codes for the board are just a "well something's ******" error.
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Replacing a failing i7-4790k 4GHz... Intel or AMD?
- Thread starter Loony BoB
- Start date
Sadly my other CPU is a 1151 so I wasn't able to switch them around!
Checked eBay for recent (July & August) selling prices and this overall should cost me around £130 for the entire swap after I sell off my refurb parts once they are back from manufacturers, so I'm not as heavily bothered as I once was. Discovered I even still have the untouched i7-4790k cooler and box in stock too, nice.
Going for it, and will look into GPU later on in the year if I ever feel like it. 980 is more than enough for gaming so far, so I'm okay. 
Checked eBay for recent (July & August) selling prices and this overall should cost me around £130 for the entire swap after I sell off my refurb parts once they are back from manufacturers, so I'm not as heavily bothered as I once was. Discovered I even still have the untouched i7-4790k cooler and box in stock too, nice.
Going for it, and will look into GPU later on in the year if I ever feel like it. 980 is more than enough for gaming so far, so I'm okay.