Hello everyone!
I've recently purchased a brand new Gigabyte GTX 770, and much to my displeasure it turns out that -for me as for many other people, it seems- lately nVidia drivers are completely broken. My PC freezes EVERY TIME I try to use a game or a browser (or displays a lot of blue and green dots, though less often), and I really am out of solutions. I tried almost everything and posted help requests anywhere, but until now no one has been able to find a solution. I used some of the older drivers as well (the most "ancient" being the 320.49 version), using a clean installation every time after removing the previous drivers from safe mode. No results. Maybe some of you had similar issues in the past and can give me some advice? I would surely be grateful!
(P.S. I'm using windows 7 Pro 64bit, Asus H87-PRO MoBo and an i7-4770 CPU).

EDIT: The card was indeed defective. Sent to RMA. Thanks for your time!

Your motherboard has an integrated videochip, I suggest to disable it in the BIOS if it is at all possible, you also might want to update the motherboard drivers as well.

Yeah, nVidia seems to be screwing up their drivers lately. I may have to jump to the red team if they don't get their shit in gear before I decide to upgrade.

Anyway, as Strijkbout said, make certain you disable the on-board video. About the only other thing I can think of is to be sure you disable your antivirus when installing your new drivers as well.

That was one of the first things I tried. Nothing happened. That I did not. But now all I see is "no signal". Everything is just going better and better...

Maybe you got a dud card? Any way you can test it in another machine?

I also have a GTX770, using the latest drivers. This is probably the most stable PC configuration I've ever had :P
(out of the ones I've assembled myself, anyway >_> )

The symptoms you describe, especially ...make it sound like you have probably have a defective GPU, unfortunately.

EDIT: On the other hand: If you've had your display cable plugged into your integrated chip the whole time, maybe it's the defective part (which hopefully won't matter too much with it disabled).

The cable was in the graphics card the whole time. Unfortunately, I cannot test it in another machine...
Actually, I would be glad if my GPU was indeed defective: at least I would know where the problem lies!

So then re-enable your motherboard graphics and take out the graphics card? That would test if it's the problem or not.

Funny how silent Nvidia fanboys are now, usually you'll get things like my condolences if you said "I bought an AMD card"

On topic, there are various things that can cause your problem. You might want to plug/unplug the cables again. Might be that your cables are messed up and not giving the gpu enough electricity. You light have a faulty gpu, try to contact nvidia support or try to post on their official forums and see if they can help you out.

Also you have done all the cleaning stuff (meaning uninstalled in safe mode, downloaded a registry cleaning software to delete old registries etc) but if you go to safe mode with network does the gpu still freezes for you?

Also is your mobo and psu compatible with the gpu? Does it get enough watts etc? Did you use the pci-expres slot and used the right 6 pin cables? (not those 4+2 pin cables). Also during replacement, did you push the gpu hard enough? (you should hear a clicking sound when it's in the right place) Didn't you touch any other hardware like the ram sticks, might be that the ram sticks got lose or something.

And can you monitor the temperatures with gpu-z? Do the fans work properly? Might be that your gpu gets heated really fast... So there are a lot of things that can cause your gpu to malfunction like that. So good luck, I know how irritating that is. If nothing works, add me on some steam chat or on fb and I will assist you on chat i I can :)

Also watch a youtube tutorial on gtx 770 installation and see what other people have done, helps out a lot :)

Good morning/afternoon/evening to everyone!
Thanks for the help until now, but there are still no real chenges (though somehow now the signal is back, don't ask me why)! I already tried what you suggest: I built a state of the art rig, since every piece perfecty fits and cables are meticulously sorted out, but I wached some tutorial anyway just to be sure: the problem is not there, everything seems to work fine. When I uninstalled the drivers, I used the "uninstall in safe mode - clean registry procedure", and I did it so many times I nearly lost count! :) I even tried formatting my disk, but nothing changes.
Without the graphics card, everything runs adequately (can't pretend too much from integrated graphics), so the problem must be in the GTX 770. Now I just need to find out if somehow their drivers don't work well on my configuration or if the card is faulty. I initally thought it was a driver problem, since this message apeared every time: "Display driver NVIDIA Windows Kernel Mode Driver, Version XYZ (I tried many) stopped responding and has successfully recovered".
I found a friend of a friend that seems to know how to help me (he has the fame of a real computer genius), so I'll let you know his opinion when he gives me one.
Meanwhile, any additional suggestion is warmly appreciated!
Have a good day!