Recently, I built my first computer:
- Intel Core 2 Duo E6600
- 4 x 1GB DDR2 RAM
- 500GB SATA hard drive
- Radeon HD 6770 graphics card by XFX - using one monitor via DisplayPort -> VGA adapter.
- MSI P6N SLI motherboard
After confirming the computer boots/POSTs fine, I attempted to install Windows 8 Dev Preview, x64 via USB, and it was extremely slow (i.e. taking many, many hours to install). I tried a number of things, eventually taking out all but 1 stick of RAM, and Windows Setup proceeded much faster - however, when Windows went to logon, the screen starts to fuzz/zig zag*, it only happens when the resolution is above
800 x 600 resolution; the monitor is set to use
1024 x 768 pixels. I first used the drivers from the CD, then went and downloaded AMD's latest drivers specifically for Windows 8. Nothing helped, not even uninstalling completely and then reinstalling the drivers.
Next, I decide to install Windows 7 Home Premium on a different partition. Same scenario with the RAM, had to take out all but one stick. Installed quickly with no issues, I even booted into Windows with no fuzzing/zig zagging issues, but couldn't use Aero, since there were no drivers installed for the graphics card - so I downloaded the latest drivers for Windows 7 x64 and rebooted, and got the exact same problem, the fuzzing/zig zagging.
I've tried all kinds of things, from installing all the latest updates in Windows (including SP1), unplugging different devices (such as the IDE DVD/CD drive), double-checking the GPU PSU connection, etc.
My question: Why is this happening at resolutions higher than
800 x 600 and what can I do about it?
fuzzing/zig zagging, I mean this, but vertical, and you can still see the image the entire time, it just blurs/fuzzes quickly, and then clears, and then fuzzes again.
Update (12-29): I swapped out my Corsair 400w PSU for a Corsair 650w, and when I boot Windows 7, the fuzzing/zig zagging is still present.I'm suspicious of my DisplayPort -> VGA adapter, should I try a DVI -> VGA?
Message received from XFX Support:
Why are you using Displayport to VGA adapters? A DVI to VGA adapter is much more natural since it isn`t really adapting anything. I think that the fuzziness is being cause by the adapter that you are using. Most 6770s ship with one DVI to VGA adapter. The power supply that you are using is fine for this card and that computer. Thank you.
Is this true, that a DVI -> VGA is more natural? Should I try a DVI -> VGA next?