Nvidia 7800

have dell 9400 laptop - jagged lines appeared on screen - connected to external monitor - same issue - felt it was graphice card - replaced same but after 24 hours issue re-appeared any help much appreciated thanks jeff
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  1. Replacement card could have been installed improperly. If you leave the laptop off for a while, does it work OK when you turn it on at first? Did the fan also get replaced or just the physical chip? Try running the laptop with the cover off to expose the chips to the air, make sure the fan works OK. Does it work fine with that setup?

    Screen connections checked?
  2. hang-the-9 said:
    Replacement card could have been installed improperly. If you leave the laptop off for a while, does it work OK when you turn it on at first? Did the fan also get replaced or just the physical chip? Try running the laptop with the cover off to expose the chips to the air, make sure the fan works OK. Does it work fine with that setup?

    Screen connections checked?


    Thanks for suggestions - I cleaned the fan (not that there was much rubbish there) - just replaced the card - have not run with cover off although point well made - I did not actually see the fan working (although it span freely) - also downloaded latest drivers - fault seems intermittent and 'repair' seemed to be ok for first day - your thoughts?
  3. Is there any vent or open space that you can tell that the fan is working and have you changed the thermal compound?
  4. +1^ for thermal paste. Clean off the chip (verrry carefully with a rag, nothing abrasive) and also the heatsink, then apply new compound. If checking all of these still gives you the lines, you have a few options, none cheap. Motherboard replacement, checking the screen and inverter, and lastly, new system. This really depends on the priorities you have with the money, new (or newer used) system is very close in price of new motherboard and screen.
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