OK. The logs show some very serious errors, and I'm not sure at this point if you have multiple problems here. The most serious is a bus connection error, which originated from IRQ18. What I would suggest is to remove this card and reseat it in it's place. Hopefully it may have just become slightly loose when amoungst the process of swapping out your RAM. This problem could have also been caused if pressing down on the motherboard too hard.
The second logs are related to this microsoft article: Possible Resolutions to STOP 0x0A, 0x01E, and 0x50 Errors. I have also ruled out software as any possible cause to this one, but could not narrow it down any further for hardware. The result of this error could have been caused by hardware incompatibility: memory, graphics card or motherboard. It's very unusual for this to be a processor issue suggested in the Microsoft article here, as the CPU needs to be operational for the log file to be created in the first place. This problem could be related to the problem above.
After reseating the graphics card, please can you post (if any), any new logs you receive.
















ones thing to note with the old RAM now back in the PC did hang which is unusual for it. All the programs went into a non-responsive state. I do recall accidentally knocking the GFX card but wouldn't the fact that it does seem stable with the old RAM rule this one out? Anyway i'll try that in the morning and report back 












Linear Mode

