garethcia please don't come into a thread if you have nothing beneficial to add. It doesn't help, it's an annoyance to read (especially with so much short hand text talk and spelling mistakes to boot).
Anyway, Kornowski. I'm pretty sure that the BSOD wouldn't be caused by your GPU. Disregarding that for a moment, have you ran with onboard graphics for a prelonged amount of time (say an hour or two at max) and had any issues? As for the BSOD, do you have any diagnositc tools for your HDD that you could run? It could just be a complete coincidence that you happened to get the BSOD at the exact same time or soon after the artifacts on POST. I'd consider the BSOD to be a completely different situation / problem to the artifacts. Sounds like you might want to troubleshoot / test all of your hardware to make sure nothing else is acting up.
There is a possibility that your motherboard could be on the blink. That would cause some sort of issue if data was getting currupted as it travelled along it. Or it could be your HDD acting up, or it could be your RAM currupting data as it travels to and from it (although I doubt it would cause BSOD's.), or it could be simply a bad software fault that would be sorted by a simple format etc. There are so many possibilities as to what the fault(s) could be, hence why I suggested so many troubleshooting methods on each component, to rule out any faults on more than just one.
If I were you, my next step would be to run with onboard graphics for a minimum of 2 hours, see how that goes while you're just browsing the Internet, if you get no issues, assume it's the card, if you do, assume it's something else (as well as or ruling out your card). Then I would trouble shoot the main components (starting with the mobo, then the RAM, then the HDD, then the CPU). I would also check my voltages within the BIOS to make sure they don't spike. If all else comes up Ok from all of that, try another PSU and see how that goes.
This is the problem with such an issue occuring. It can be a number of things, you just have to try everything and see what the results are. At least that way you have something to fall back on / add to the engineer on the phone when you mail back your components and/or ask for advice. Try giving the place you purchased your hardware from a ring, explain your problem and see what suggestions they give you (although in my experience it has been I that have had to say things to the engineer to get my issue sorted, they can't half be bloody useless at times).
Breaks.