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Strange screen artifacts with my 1 GB ATI Radeon HD 4850

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My setup (4 years old now):

 

HP Pavillion Elite HPE-170t

  • Intel(R) Core(TM) i7-860 quad-core processor [2.8GHz, 1MB L2 + 8MB shared L3 cache]
  • 8GB DDR3-1333MHz SDRAM
  • 1TB 7200 rpm SATA 3Gb/s hard drive
  • 1GB ATI Radeon HD 4850 [2 DVI, HDMI and VGA adapters]
  • Lightscribe SuperMulti DVD burner
  • 15-in-1 memory card reader, 1 USB, 1394, audio
  • No TV Tuner
  • Creative Sound Blaster X-Fi Titanium

Starting the other day, I am getting strange screen artifacts. Sometimes i will have horizontal lines, sometimes vertical bars, sometimes strange checkerboard pink squares (that will disappear sometimes when I use my mouse scroll wheel).

 

I have updated all drivers, started in Safe mode, went back a few weeks on recovery - and rebooted a lot. Sometimes the errors are fixed, sometimes not. I also cleaned out all dust from inside. Temps here are pretty much the same everyday also.

 

I guess the video card is going bad, but I'm hoping there may be an easy fix i have overlooked. If not, I will need reccomendations for a new video card.

 

Thanks!


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