GT 70 missing graphic card and constant fan noise Issues

Question

Not even sure if this is the correct place to post this thread if not could someone move it to a different section.
So today for some odd reason my laptop decided to freak out on me. I get a bluescreen saying VIDEO_TDR_FAILURE, I have GT70 NVIDIA GTX 675m I was doing a scan on my computer and the lower right hand corner it said Application has been blocked from accessing Graphics hardware. So before it kept saying that over and over again. The computer basically just lagged out and I did a hard shut down to turn it off. I turned it back on and it started up to the BIOS for some unknown reason I didn't press any button so then I go over to Save & Exit and it said do you want to save the changes, I said no and it started up again to the desktop but very slowly.
Then my desktop finally shows up but now I hear what appears to be my video card fan or the fan that turns on when you are overclocking or just when you hit the fan button on the keyboard constantly running. I am freaking again myself because I don't want this laptop to die on me. My NIVIDIA card is no longer even showing up on the taskbar, even when I go to control panel I click on the NIVIDIA control panel and it doesn't even come up. So I try doing a system restore, after it restarts the video card is showing up I do a couple of restarts to get things back in order again. Even the fan is no longer blasting like before which puts me at ease.
I go to watch a YouTube video and then the video freezes then in the lower right hand corner I couldn't see what it was because it faded away something about the video card crashing so then after it crashes my fan starts to go off again and I am freaking out again. I tried to do another system restore but it seems that it's not working any more. Is my video card dying or do I need to install new drivers for it.
How come it's no longer showing up on my device manager? Did it die or something?

Answer 1

It has been acting very strange today. I turned it off last night and went to sleep, woke up a couple of hours later to turn it back on and it went to the desktop very slowly but my GTX 675m card showed up in the display under device manager also the fan was working normally like it usually does and not constantly going. I was sort of shaking my head not understanding how it showed up again.
So I took it into a computer repair place to see what they might make of it. Won't get any word until tomorrow or Monday to see what it might be, strange enough when they booted up the system at the computer place it booted up quickly and he told me that the GeForce Experience thing opened up and all that. But I don't really trust the laptop, I told them I would still like for them to check it to see if my GPU is really dying. They said they will run some tests to see if it's a hardware problem or software problem.
As for buying a new GPU I am not sure i want to pay that much, is there something more cheaper that might be better than 675m? I keep hearing people saying how bad the 675m is and how NVIDIA does not care much for that particular card. Also my 2 year warranty for the laptop just expired in January and I have no idea why this always happens to me once the warranty expires something wrong happens, not sure if it's a coincidence or just bad luck.
Guess I will see what happens when I get the computer back from the repair place, paid $89 dollars just for them to check it which they say is a lot better price than Geek Squad cause they would have me paying $200. Ugh! This crap makes my anxiety go sky high. Hate to lose my laptop, I mean it seems to boot up to the desktop but that stupid cooler fan going full blast is what concerns me.