Toasted GPU or drivers?

Arkanus

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Greetings!

I started to suffer graphic corruption issues two days ago. Everything started to distort and I had to restart quick (otherwise, the screen ended up going all grey-ish with a lot of ugly lines). After two restarts, everything was ok again until the day after. The same happened last night, and it got fixed after 2-3 restarts.

This morning, after doing a "system restore", update my GPU's drivers and scan for malware, I left a game running (Rome II) to check if indeed my GPU was getting toasted, or if it's just a matter of bad drivers. After 1-2 hours, my screen goes completely blue-ish with a lot of little lines after loading a map.

Now, every time I restart my PC, I'm greeted with a login screen full of black lines, like this: https://dl.dropboxusercontent.com/u/56345445/thehorror.jpg

Once I log in, the screen goes completely blue or black, with perhaps a few artifacts here and there.

The graphics corruption appears only in normal mode, after loading Windows. There's not even a single artifact/issue in the BIOS screen, during Windows 7's load or in safe mode (I can use my PC without issues there).

I tried to uninstall/remove the GPU drivers in safe mode and then restart in normal mode. Everything fine, until Windows detects the card and makes me restart again. I do that... and blam, corruption in the login screen again.

Does it sound like bad drivers, or toasted GPU? Should I format my hard drive and reinstall Windows, or that wouldn't help at all?

I hope someone can share a few opinions and help
me a bit with this issue, specially since I use my computer to work at home. I'd be really thankful!
 
Solution
Sounds like a faulty GPU.

The card might be having problems at certain resolutions or color settings.

They changing the resolution to 720p and 8 bit or 16 bit color.

See what happens.

Arkanus

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Thank you for the reply!

I uninstalled the GPU drivers in safe mode, and then I restarted in normal mode. Once Windows detects the GPU and installs its basic drivers, the black lines get back after restarting (in nornal mode).

I tried to install an older version of the drivers I was using too, with the same result.

Isn't it supposed that the graphic corruption would appear in safe mode, the BIOS screen or during Windows' load, if the GPU is bad?
 

Arkanus

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AMD Radeon HD 6870. It's 3 years old.

I didn't make changes at all in the last 5-6 days, besides installing a game (Crusader Kings II) and the driver for a Xbox 360 controller. I uninstalled both things just in case, but... same result.
 

Arkanus

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Sadly, I don't think there's a way to change the resolution or color settings of normal mode in safe mode, unless I'm wrong!

I can't change them directly in normal mode since I can't get past the login screen. As soon as the desktop loads, the entire screen gets covered with blue or black artifacts and I can't see anything.
 

Arkanus

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An update: I have tried with a smaller monitor (and 1360x768 resolution) but I have the same issue (my other monitor is 24", 1920x1080).

After letting Windows install the basic GPU drivers and restarting my PC in normal mode, the screen is still flooded with black bars in the login screen. Everything goes black/grey/blue-ish as soon as I put the password and proceed to load the desktop.

Once again, it works fine in safe mode, or in normal mode as long as I'm not using GPU drivers at all (which makes me deal with a horrible 1280x960 resolution).

I just noticed something: As soon as the screen corruption starts when Windows loads the desktop (forcing me to hard reset), the "welcome" sound loops forever, which makes me cringe a bit. :(
 

Arkanus

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Formatting my hard drive and reinstalling Windows didn't work... so I decided to try an old Nvidia 8600 gt and it worked. I think that my 6870 is indeed pretty much dead.

I hope those issues weren't coming from the PSU, its cables or the connectors. The old 8600 gt I'm using right now doesn't need need PCI Express 6-pin or 8-pin power inputs... the motherboard's PCI Express slot is enough.