Okay, I don't know if this needs a new thread or not, but I'm worried. I just got in all the parts for my new PC yesterday (Antec Sonata III case, 3 ghz Core 2 Duo E7500, 4 GB of RAM, an Asus P5QL motherboard, and the aforementioned GeForce GTX 260) and put them together. I had no other OS, so I used a Win7 RC1 (build 7100 if it matters) disc I had for a while and got everything set up.
Installing Windows was a breeze, and setup and all went A-OK. Got connected to my home's wireless network and so on, and things were fine. However, after about 30 minutes of doing little things like getting Firefox downloaded and starting to download some driver updates and in general getting used to Win7's UI, I got a BSOD, with an nvlddmkm.sys error. The PC auto-rebooted, POSTed fine, and proceeded to the Windows loading screen. I got the nvlddmkm.sys error again, and it repeated the cycle. I booted into safe mode, and I could do everything in that. I looked around and began to discover that it seems to be a video card driver thing, so I finished getting the latest drivers and installed them. I rebooted and no longer got the error, but the trouble got worse.
My display locked to 640x480, and nothing could get it out of it. There are what I can only assume are artifacts everywhere (it looks like when you get locked into an 8-bit color display), even during POST and in the BIOS setup. I've cleaned out the old drivers, installed older drivers, the newest drivers again, and anything I can think of. I've reseated the video card, and I'm at a total loss here. I have no idea what could be going on, but I'm very worried.
Any idea?
Edit: Going into Device Manager, the 260 has a warning symbol on it, and going into it produces the following: "Windows has stopped this device because it has reported problems (Code 43)".

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Edit - although that warning in Device Manager could mean something else is at play here... have you tried uninstalling the card, then rebooting?
Nothing's forgotten, nothing is ever forgotten
The artifacting also occurs right as the PC boots up as well, even if the system has been off for tens of minutes, and should be quite cool.
- The Four Horsemen of the Apocalypse (2017, colorized)
Nothing's forgotten, nothing is ever forgotten
Edit: Well, I've tried about everything I and a friend can think of. We made sure it wasn't the monitor, made sure it wasn't the drivers, and made sure it wasn't the PSU, so about the only thing we can think of is that it's just a plain old hardware failure, and that I should probably RMA it.
- The Four Horsemen of the Apocalypse (2017, colorized)
Nothing's forgotten, nothing is ever forgotten
- The Four Horsemen of the Apocalypse (2017, colorized)
IT'S HIDEOUS! BURN IT WITH FIRE!!!
Anyway, I have a GTX 260 on Windows 7 and haven't had any trouble at all with it, except that the drivers from Nvidia aren't very smart about switching to/from TV out. They've had that problem for years though
So long as you've covered such bases as heat, power supply, and stray pieces of metal on your card, that looks like a replacer to me
Nothing's forgotten, nothing is ever forgotten