BSOD starting to desktop, error 0x0000050

Hello SevenForums community. I come to you with help about yet another DREADED BSOD!!!

First I shall describe my situation. My computer is a custom build I did myself and I have been using it for over a year with relatively no problems. However, for the past few months everything has been going wrong with it in such an inconsistent way I cannot isolate the problem. Yesterday it ran perfectly fine nonstop for 12+ hours while this morning I can't boot without crashing as soon as I reach my desktop. I get crashes that only sometimes are blue screens. When this problem started the crash code I would get was mainly bc code f4 but sometimes it would be bc code 50 or 51. When it crashes w/o a blue screen my computer just goes to black and all the fans spin up as if the computer is trying to start up, but I cannot hard reset it. Only thing I can do is pull the power plug. The kicker here is that these problems have persisted through multiple reinstalls of windows using different hdds and different methods, i.e. cd vs usb. While the bc codes might change between the three, using bluescreenview to look at my dump files they always say ntoskrnl.exe was the problem. Right now the only way I can boot is into safe mode.

Now as far as what I have done to try to fix this on my own I'll try to give as much detail as I can. I have looked up each bc code to see what it affects and how to fix it. I have run Seatools, Western Digital's hdd checker, and check disk but all my hdds pass short and long tests. One drive did have a bad sector after a Seatools long test but it was fixed and now consistently passes. I have switched my hdds around with different sata cords and in different sata ports on my motherboard. I have left just 2 in right now to minimize errors, one for Windows and Wildstar and one that has my media library so I have something to watch. I have tried booting with every possible combination of ram and it still crashes exactly the same. I have run memtest individually on my ram sticks and on them together getting no errors after 4 passes. I have switched my graphics card in case that was the problem and it had no effect. I have completely taken my computer apart, cleaned everything, put it back together and it still happens.

What am I doing now? Well after this most recent reformat and reinstall of windows on a fresh drive I'm getting mostly bc code 50. So I tried out memtest again with no errors after 4 passes.

I should say my computer was originally overclocked but completely stable. It ran prime 95 a full 24 hours with no errors and not going over 60C. Since these problems started though I returned it to stock settings.

At this point I'm thinking my motherboard is just bad. I have no idea what to do anymore. I'm not sure if this is important but since these crashes began, when my computer is started up for just a bit, and when I'm in safe mode with networking, the internet icon in the taskbar displays the red X icon for no internet, but it does work. Also since these crashes started the debug LED code on my motherboard always lists A0 for "IDE initialization is started" where before it would just have AA displayed which my user's manual has listed as "reserved" but I assume it means everything is fine.

Motherboard: Gigabyte F2A85X-UP4
CPU: AMD A10-5800K with Corsair Hydro H60 cooling system
RAM: 2 sticks of Patriot Memory G2 Series 8GB
GPU: EVGA Geforce GTX 650 and EVGA Geforce GTX 550TI. The 650 is currently plugged in as I'm writing this post.
PSU: Rosewill Green Series RG630-S12 630W
HDDs: Seagate SV35.5 500GB <----plugged in, has windows
WD Caviar Blue WD10EZEX 1TB <----plugged in, just used as storage
Seagate Barracuda 7200.10 80GB
WD Caviar WD2000 200GB
Seagate Barracuda 7200.10 250GB
Maxtor DiamondMax Plus 9 160GB
OS: Windows 7 Ultimate 64-bit

Please let me know if there is any other information that is needed and thank you in advance for any help you may be able to offer.

An update on what has been happening with my computer. After my post yesterday I was able to use it fine for about 5 hours until I had to leave. Today when I started up it went straight to check disk and then after that it booted, made it to desktop, then the screen went black and I couldn't hard reset it. I had to pull the plug. I might not get much testing later because I will be busy today. I will post any new info as I get it.

Well got another bsod today. Computer worked fine for 2 hours after I turned it on then i got a BC Code: F4. After it shutdown from the crash I tried to start it in safe mode but it hung up while starting the drivers and the top 1 cm or so of the screen was covered in artifacts. It then restarted entirely on its own and gave me this:

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.256.1
Locale ID: 1033

Additional information about the problem:
BCCode: f4
BCP1: 0000000000000003
BCP2: FFFFFA800EF79730
BCP3: FFFFFA800EF79A10
BCP4: FFFFF8000318F270
OS Version: 6_1_7601
Service Pack: 1_0
Product: 256_1

I will upload the new Dm Log Collector file I generated after this bsod.

I received 2 more crashes last night. The first one happened when I was trying to download something with utorrent. I got an error that said the disk was unwriteable I think, it popped up in the task manager fast so I couldn't really read it, then my computer promptly crashed after that message popped up giving me an f4 bsod error. After it restarted it went to desktop just fine and in uninstalled everything utorrent related and deleted all related files. I tried to install wildstar onto my TB harddrive that is plugged in and it got 4% done then it appeared that my TB remounted itself. I got the autorun dialogue box that pops up as if I had plugged in a usb drive. The install failed so I closed and was going to shutdown and worry about it later. As I was shutting down it crashed again giving me another f4 bsod error.

Attaching the new Dm Log Collector file I generated after these.

Well thanks for being the only person to respond. Can't afford genuine Windows so I guess I'm on my own.