Would appreciate some help identifying this problem please.

Mak, lets reinstall the Nvidia drivers in this fashion. It will give you the cleanest install NVIDIA Drivers - Avoid Problems

Next, please go into BIOS and tell me the value of the +12V, +5V and +3.3V also tell me the temp readings of the Motherboard and the CPU.

When you had the BSOD did it tell you the display driver stopped working first?

Also please download Ungine Heaven 4.0 and install it. After the driver install, run the benchmark using the preset extreme. It should look like this.


Once it starts you can click the benchmark button to start the benchmark. Save the results and uoload a screenshot of the results. This will tell you how. Screenshots and Files - Upload and Post in Seven Forums

The voltages and temps look good. The CPU fan is a strange reading though.

The BIOS isn't seeing any of your hard drives at all?

I find the odds of both drives going out at the same time astronomical. Baring some other event I would think it is highly unlikely that could happen. Do you have another computer you could connect the drives to, or an external enclosure that you could put the drives in to test them? I think I would try that before making any decisions. The possibility exists that you may have some problems elsewhere.

Everyone has been concentrating on the graphics card so far, when the problem could have been somewhere else.

Mark 3D 11 is testing the Graphics card, the CPU and the ram at the same time. It is pretty much of a system test. That is why I got you to run Ungine Heaven. Heaven is pretty much a graphics only test. It does not involve anything else. But, it does put a lot of strain on the graphics card and should, and normally does, show up any deficiencies in the graphics. I don't believe either of the tests are particularly hard on the hard drives other than they are reading the information and feeding it to the testing program. But, that's what hard drives do with any program.

However, with any stress test of any kind, it also puts a lot of stress on the Power Supply to put out the necessary power. During the test, your GPU was operating at it's max and therefore asking your PSU to supply the max power in order to render the program.

Mark 3D is more stressful on the PSU because it is having to provide more power to several components at the same time. The fact that you didn't uninstall the AMD drivers made the graphics card the more likely suspect, but, in my opinion, that should have affected other normal programs as well. That is why in my first post I asked for the power supply readings. But, that will tell you the readings at idle, but it will not tell us how it responds under increased stress. It is also why I asked for you to run a test for only the Graphics card. It would tell us if the card was the problem or if we needed to look elsewhere. But, I see no circumstances where it could have caused both hard drives to go bad at the same time. In the worse case scenario it would have only been the drive with Heaven installed on it, although I seriously doubt it.