Great detail in your report and troubleshooting. I would tend to agree in your conclusion. Hardware does occasionally fail. I would recommend getting an RMA for the MB and CPU. You may want to start with the CPU and if that does not resolve the issue then the MB. Do you have access to another CPU that you could test to help narrow down the failure?
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Here is a good Processor test suite that may be helpful.
And a few other diagnostic tools:
Really? you both think its hardware? in your detailed diagnostic you revealed how it can't be hardware by stating that when the driver isn't loaded, the hardware works fine. This is an excellent way to show how the software (driver) is the problem.
Second, RMA the CPU and the MB? really? Lets say that for some reason, it is hardware (going against all logic as laid out in the detailed troubleshooting steps taken above) The GPU is integrated into the CPU so that could be the only hardware place that could possibly be bad. The MB has no graphics processing capabilities, just the PCIe bus that takes the GPU signal and routs it to the port. Now, unless there is a bug in the chipset that is only activated by the use of the Intel HD graphics driver that switches the output, it cant be the MB - and even if there was this bug that only works in this very unlikely way, it would still be software, either by being the .inf files for the chipset or the BIOS files for the MB.
This is clearly a driver issue that Intel is either choosing to ignore (see thread: Re: Intel HD 4000 No Display after loading Windows 7 ) or by simply neglecting to fix. Robert_U was active over there, but for some reason has not responded in months. Yes, this has been an issue on their premier CPUs w/iGPU for months and still no resolution. Intel makes fantastic hardware but I'm guessing they got Bob from Accounting to write their drivers.
*steps off his soap box, gets in his car and drives to the store to buy an AMD branded product*