5 Replies Latest reply on Nov 23, 2015 7:11 AM by lordkai

    Very interesting graphics card malfunction?



      I have SAPPHIRE Vapor-X Radeon HD 6870 graphic card, on factory settings, not OC-ed (2 years old, thermal paste changed twice, no dust – keeping it clean).

      Motherboard ASUS P8Z68-V Pro. Intel Core i5 2500k, 8G RAM, quality PSU Corsair gold 750W. & 2x installed Windows 7 64x Ultimate (2 system partitions).

      Graphics card run on max 70-71°C during longer gameplay. Max 40-41°C when idle. 1280x1024 screen res. Playing games occasionally only on weekends about max. 3-4 hours straight (not heavy gamer).


      Few days back, during game play (WoW WoTLK) screen just suddenly turned black (without turning off screen by "no signal" state – screen is just on, but black), nothing I could do, just to reboot my PC.

      After reboot, on windows logon screen appeared several horizontal white (or maybe bright gray) lines about 1, (1 and 1/2 cm) thick, and with 4-5 cm distance between them. (mouse pointer go over those lines not under them and number/count of the lines rises with higher screen resolution and vice versa). No lines during boot (windows loading screen and welcome screen Works fine).


      Right after successful login attempt (typing right password +enter), screen turns black again and no response from PC. (same result on DVI as VGA as HDMI, same with lower/higher resolution by win safe mode, same on different screens).

      If I try to shut down the PC from win logon screen (with lines) there is usual "windows is shutting down" massage and after that just "no signal" turn off of the screen, but PC wont turn itself off.


      Fan on the card works fine & no temperature issue. Then I disconnected the card from PSU. After that I rerun system on that Intel graphics from CPU (core i5 support). Everything is working ok. Made backup of my files & reinstalled Windows (just in case, so I can perform "clean slate" test). Connected GC to PSU (btw PSU cable voltage is without spikes all within normal).

      After clear win reinstall graphics card works (on any resolution). UNTIL...

      Installed latest AMD for Radeon HD 6800 series driver & after reboot got immediately the same result with black screen & white lines. Not software/compatibility issue – tried on clean install of Windows.


      Bottom line is: on pre-installed win 7 general/standard VGA driver (MS) my graphics card is operating normally, but after install of ANY version of manufacturers drivers (even through windows update) I get same white lines/black screen problem.


      Is the graphics card bad? Any ideas why it is so weird?


      Thanx in advance for any info.

        • Re: Very interesting graphics card malfunction?

          unfortunately sounds like the gpu is dying , when generic drivers are used the gpu isn't under any load , once you install the drivers the gpu can now be put under load and the problem pops back up

            • Re: Very interesting graphics card malfunction?

              Thanx for quick response,

              on generic vga drivers I tried, I pud output also on LCD TV full HD screen & it let me set 1440 x 1080 resolution, but I am going to try to run a game under this circumstances (graphic sett. maxed out) & we'll see if load/duress is the problem here, I'll let you know, how that goes.

              So correct me if I'm wrong - it's likely the case but - If you are right, it should go black again after running a game or game should not work at all.

            • Re: Very interesting graphics card malfunction?

              So we go with win7(sp1?),all windows updates installed(includes optional).

              Try :-

              Clean Install AMD Graphics Drivers

              2 of 2 people found this helpful
                • Re: Very interesting graphics card malfunction?

                  Thanx for your response,

                  yep, all win 7 updates installed (moreover clean install of windows) - except 1 optional (win 10 - sys tray update popup) and 2 important (but not recommended or security ones), which were never installed, even during times when the card worked properly.
                  I already tried this method, but I am skeptic, and this is not the case (I always install after proper uninstall & only drivers themselves, but not supplemented utilities like catalyst cc or gaming envolved app, etc.)

                • Re: Very interesting graphics card malfunction?

                  Very interesting indeed.


                  I tried my mentioned graphic card (GC) in another PC and it did same thing (lines).


                  So at least now I know for sure that GC was bad, and not my motherboard or something. Yes, it WAS.


                  I am not joking, I put my card apart (removed thermal pads from memory, removed thermal paste), and I overheated it with hair drier for about 5 min. Then I let it cool off, re-applied thermal paste on GPU, but did not put new thermal pads on memory chips though, and GC works! I dont know how but it works...


                  Still do not know (and it is bothering me a lot) what was the problem here and if it would reappear again. Why the GC behavior was/is so weird?

                  It looks now more like chemistry to me than electronics. :-/