Win 7 Crash on Startup

So heres the deal. I finished building this computer about a year ago and put a fresh copy of win 7 pro (64 bit) on it. I soon discovered that after starting up and displaying the windows logo I would get the blue screen of death and it would hence crash and restart. I first sent the motherboard back and had it replaced. Then the processor, hard drive. I also tested my RAM by swapping out the two sticks I had into different drives and then taking one out at a time. Still no good. Finally I replaced the video card with a new one and now instead of a blue screen after the windows 7 startup logo I get a mouse on a black screen before reboot. I am wondering if I should try the power supply next, as the video card tech support people said it might be since I was getting a power kernel error on startup, when my PC would crash, that registered itself under Event Viewer. However I am not sure if thats the case since I know longer get that power kernel error with the new video card. Its either that or the ram, which I already tested so I am pretty sure its good. If it isn't either of those then that rules out the possibility of a hardware issue, and I already did a reinstall with a different copy of Windows 7 as a test, which failed, so I am pretty sure the software is good. If you would like to see a list of my PC hardware + software specs check my profile.

NOTE: It only gives me the error off of a cold boot, usually longer than 12 hours.

But what do you think.... hardware, software, or does my computer just hate me?

Have you ever tried cold-booting in safemode? If you can cold-boot your system in safe mode with no errors, then that means one of your drivers is causing the problem.

I think it's either one of the drivers or your power supply.

If you can, try sticking a friend's power supply in your system.

Your PSU's specifications are enough (on paper) to run your system, but it may be of low quality and may be failing.