I fixed this a while ago and thought I would post here. This for AMD card users that are experience random "stalls" or "blue screens" that are seemingly random sometimes on desktop, sometimes mid game and often accompanied by a buzzing noise..
I was receiving the error x0000 and couldn't figure it out for a while. Its took me a long time to even figure out what causes the crashes, I changed all my RAM, GPU and Power supply to eventually download a program called "blue screen view" this tells me the reason for the crash. Every crash has a file called "atikmdag.sys" address in stack "atikmdag.sys, so that must have been the root cause.
Yesterday I did a full clean of my Drivers, removing all the root folders as to the best of my ability through manual doing it using this guide - and using the program Driver Sweeper or you can find something similar.
This meant that the GPU was completely uninstalled, the reason I did this was because "atikmdag.sys" is a GPU driver Error and it has nothing to do with anything else, but people liked to tell me my power supply was too small as my card was large (3GB) or temps were too high, they weren't.
I then went an did the BIOS update, it was super easy. I had a P8Z77-V-LX, I simply 'googled' it and downloaded the latest BIOS version that they said had "stability fixes" and installed it using a pen drive, now I highly doubt it will fix my problem because it just seems like a common AMD driver one but I did go from version 1200 to 2400 and everything seems to be working.
The I got one "system_thread_exception_not_handled (atikmdag.sys)" and looked around some more to solve it fully.
The steps I did to fix the issue or atleast it hasn't happened for months now was to do this.
1) Cleaned pc fully in safe mode removed all root folders manually of old drivers + via software.
2) then installed the latest driver for my GPU, selecting advanced mode and only installing the video and Audio driver, NO CCC program form AMD, it's practically bloatware.
3) After a full fresh install of GPU driver I updated BIOS as explained above.
Finally the most important thing and what I believe fixed this stupid issue was flash player.
I began to notice that it would happen more frequently with Chrome then Mozilla running so I did some digging and it seems AMD cards simply don't like flash player. To stop the crash I loaded a YouTube video, right click the video and disabled Hardware Acceleration for Chrome and Mozilla. This solved the issue for me. I think it gets confused with when to use your GPU as mine underclocks when not in use etc. So disable it and your crashes should go.
I listed the other steps just to help others as those are all the steps I took to fix it so its best to follow all the steps.