Graphical errors, cannot boot osx, AHT does not detect errors either

So to give some info, i had OSX Mavericks Boot-camping Win 7. This setup has worked perfect. I did have an issue in i think it was called the MBR? sorry if not... but what happened was i partitioned my already partitioned drive again, which causes me to not be able to boot to windows, which i fixed and i could launch to windows again. So that's the only error ive had with it, but was caused by me.

That^ is a video of before the AHT test, and i never continued it so from there ill describe whats been happening. so i say at the end its working if i don't continue it but that's a lie so yeah disregard.

THIS IS FROM THE START OF MY PROBLEMS :

I also could not boot into OSX during any of this.

So i started having random crashes about 3-5 days ago, it started with a white screen, to the blue screen of death. after i booted to windows 3 times, all times it crashed within 10-15 minutes all went to White screen to blue screen of death. During these boot attempts i had issues with the screen. thinking i had some nasty virus i booted to safe mode, ran a TON of scans with AVG PC tune up, and Removed tons of junk files. Booted safe mode a second time and its colors were distorted and more contrast-y (not a word, i know) so right then and there im like is my graphics card dying?? After that i found a win7 disc to reinstall or repair, but first i got my files on my external in safe mode, so i try to repair and cannot, so im like meh ill wipe and re-install the partition, still graphical errors after re-install and super zoomed resolution. so that was unusable, and so i made the executive decision to restore my drive to one partition, i got rid of windows partition and its recovery partition, then wiped the OSX Partition. Which i realize now i probably could have used it there. But i will touch on this part again soon.

So after all that i decided go on another computer i have access to, put VMWARE on and cracked it and made a guest OSX, created a bootable Mountain Lion drive on disk utility, and it wont even install. im sitting here thinking, "great no OSX on it now, cant install it and i can only use a SH*TTY windows." So in turn i wish i didnt wipe the drive of OSX. back to google i go and trying to figure out what is causing this, well the symptoms of a dead logic board are pretty accurate, crashes, graphical errors, lines, hot at the back(not 100% of the time, but my arm has touched it by accident before and it was quite hot, but this was months before this). so im like great my logic boards dead. looked around online, not horrible to replace, but then im like wait ill call this guy who has tons of Mac computers who lives nearby, ask if has one, then he suggested running the AHT (didnt even know i still had a disc that will run it, good thing since the drive is wiped) to be sure its my Logic board before i buy one, so i run the extended one, took about 1H:15M, and it detected NO PROBLEMS!? i was hoping for a problem so i know what to fix...well i called the guy back and he said he has had that happen before, he said he had to replace the hard drive, and that a faulty hard drive can cause this, but ive never heard of graphical errors from a hard drive so here i am getting a second opinion.

So here in short form is what i can/cant do:

-can install and work on windows but basically safe mode only

-cannot boot to OSX from disc, USB

-cannot install from USB or disc

During the last 2 listed if i tried to do those they would show the apple logo, a progress bar, and the spinning circle, (not the beach ball, the lines spinning in a circle) the bar would go like 5% full then shut off.

So i have no idea what to do here, if any of you can suggest anything that would be great, i can give more info for whatever is asked but im sure this is a long enough text already, i really hope someone has some idea what to do with this!