I got a blue screen on Windows 10 with the error: Driver IRQL not Less or Equal nvlddmkm.sys
I did some searching and found out some stuff about this IRQL junk. I'm not 100% sure about all this, just what I've found online. Apparently two devices have the same IRQL number which is causing a conflict and crashing my PC. I found out it's my GPU (GTX 780) and my new Elgato Game Capture HD60 Pro. The topic I found said to uninstall the driver and restart the computer. Hopefully it would fix it. I did this to my Elgato. It didn't fix it. It didn't reinstall the drivers. I reinstalled them myself and they still have the same number. So how do I go about fixing this?
Forget about the IRQ stuff. Similar devices tend to share IRQ since the line triggered lets the CPU know which type of device needs attention.
That error means your video card overheated prolly or some driver issue.
Essentially you have 2 components, either of which could be the source of the bsod, or maybe it's just how those two components interact.
Update/downgrade the drivers (incl different OS) to find different driver combinations, run some stress tests on it using FurMark and see what happens. Monitor the video card temps while you do this. I use afterburner but any other program should also work. Even Speccy.
If you think it's the Elgato game card, then change the drivers for it (use a different OS's drivers to test it out) involving temporary OS's on a temporary partition.
After a while you should notice some pattern like "issue only occurs under windows 10" "Does not occur using hd60 pro driver versions older/newer than x"
This is really one of those labor intensive things to test since it's strait-experimentation unless you want to contact Elgato support.