Willow Pond PC Tips: The Green Line of Death

     

May 2001: Photograph of the "green line of death"; Windows 98SE, Abit KT7, Athlon 1G, nVidia GeForce AGP card. With another video card (nVidia Riva TNT), the line was a continuous bar rather than the broken line displayed at the top of the screen here.

I encountered this problem with at least two video cards and Windows 98SE. Upon boot up, Windows makes it as far as the login screen, then freezes with a thin green bar (or green line) is displayed across the top of the screen. Only a reset or power-off will exit from this screen. This problem occurred not on every boot, but frequently enough that it needed to be fixed.

In the pre-Google days, searching was reasonably primitive, but I did find this question, with a strange list of answers, buried in the GeForce FAQ site of the day(1):

Q. Windows locks up before it finishes loading, and a thin green line may appear across the top of the screen. How can I fix it?

  • This may be caused by the Backup utility supplied with Windows 9x/ME attempting to detect new tape devices on boot. You can fix it by deleting the files drvwppqt.vxd and drvwq117.vxd in the Windows\System\Iosubsys directory. If this helps, then search for the string 'TAPEDETECT' in your registry and delete any entries that exist. If you find this causes your tape drive to stop working, you'll have to reinstall Microsoft Backup. You can also simply uninstall Microsoft Backup if you don't use it.
  • Try updating the motherboard's BIOS. In particular on some Gigabyte boards based on the VIA KT133 chipset this may fix the problem. See the following page for more information: http://www.giga-byte.com/faq/question/question_kt133.htm This may also fix the problem on ASUS A7V motherboards - upgrade the BIOS to version 1004C or later.
  • You may find that on motherboards that are only AGP 1.0 compliant you may be able to fix this problem by putting insulating tape over the last pair of contacts on the AGP connector on the Ge Force card (the contact furthest from the monitor port, on both sides). This has been tested on the Chaintech 6BTM motherboard.
  • Try disabling the Windows startup sound.
  • Make sure that VSYNC is enabled in the NVIDIA control panel.
  • If you have IomegaWare installed, try uninstalling it. If this fixes the problem, just use Iomega Guest.

Quite an impressive array of disparate solutions! At first blush, none had success written over them. If you look at the list, few have anything to do with video: uninstall backup? disable the startup sound?? And that one suggestion that is video card related has a distinctly Car Talkish quality to it: cover some AGP contacts with electrical tape - geesh! But one has to start somewhere. Astonishingly, fix number 1 works. After renaming the two Virtual Device Drivers (VxDs) for Windows Backup, the green line/freeze never occurred! I restored the original file names then removed Backup completely with an uninstall. The deadly green line was forever a thing of the past with both nVidia cards.

I mentioned all this to a computer guru we'll call "Rick" who promptly attributed all this to my general naïveté with upgrades. About four months later I received an e-mail from him stating that he "was just able to fix a friend's PC because you sent me this link. He has a FIC MB with nVidia TNT2 VGA card and was also getting the green line of death on boot."

Reference:
1. http://www.geforcefaq.com/faq.cgi#hw:gef:troub:startup:startlock - This link has long expired, but that was the page accessed sometime in the spring of 2001 and the original source for the above quote. The domain geforcefaq.com now seemingly has nothing to do with nVidia.

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