BSOD - primarily when using Lightoom (sometimes just randomly)

If you want to try that first, go ahead. But, I would also suggest, if you haven't to run your Hard Drive Manufacturer's diagnostic program on all hard drives, both the short drive self test and the long test. If you have a friend who is good with electronics and has a multi meter, see if you can persuade him to come over and test your PSU. If it is possible, see if he can test the 12V rail at full load as well as at idle.

If you will tell me the had drive manufacturer, I'll give you the link to their diagnostic test.

When you did Driver Verifier, you should have selected only non Microsoft drivers, and crashing upon the OS loading should be a sign it is a third party driver.

Pretty much, it is. It is turning out to be one of those tough ones. If you have replaced the Motherboard, if I am right, then test the hard drives, and can get a good test (and person doing the test) on the PSU, it seems there is nothing left but software.

Well, software is a different animal than hardware. A piece of software can be fine, but conflict with another driver from another piece of software. By themselves, they are fine, but together they will crash the computer. And it is very difficult to tell which 2 pieces are doing it. Then there are other pieces of software which are known to cause BSODs, McAfee being one of them and is almost impossible to completely get rid of.

Please post the dump file located at C:/windows/minidump. It will probably It is probably the last one, but the numbers ate the date and time they are usually 0622140156 which would be 06-22-2014 at 1:56 plus the seconds. But, you will have to provide admin permissions, but copy them and paste them to a folder on the desktop. Then highlight that folder, right click it, select send to > compressed zip folder and upload it using the paperclip icon in the reply window.

Odessit, just be a little more patient and relax. I have called in the Calvary to help. It hurts my Ego to do that but, I think it's needed. I almost believe it is the Lightroom program itself causing the problem, but we'll see what all the smart guys say. If they figure something else out, then I will admit they are smarter than me. Begrudgingly, of course.