Why is my screen outputting strange characters and weird colours?

Nouri Alnahawi November 4, 2012
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Hi everyone,

My 11 year old nephew was playing Minecraft, or was “downloading” it on PC when suddenly the screen went dark and showed “No Signal” even though the PC was still running. We couldn’t bring it back so we reset the PC, and then it got worse. All letters, numbers or symbols were somehow destroyed, even before Windows had started.

It was like when old NES games suddenly crash. And in Windows it was also like that, only not in 8-bit color. I’ve already tried resetting BIOS by removing the battery, but it didn’t work. Please tell me it’s not what I think it is…

Thanks in Advance

P.S: My sister’s PC has Panda antivirus on it.

  1. Sashritha Peiris
    December 16, 2012 at 9:09 am

    Probably because your monitor cable is broken. Try a new cable then a new monitor

  2. Nouri Alnahawi
    November 10, 2012 at 7:15 pm

    Thanks a lot guys. It was the graphics card, it's damaged. I don't know how this happened out of the sudden, but I just replaced it and now everything is ok :)

  3. Isabella
    November 8, 2012 at 3:31 am

    Ok so im only 12 and have an andriod. I had my
    phone on at school,i accidently dat on it. Then
    I cheked my fone after school and the screen looks
    horrible. Its differnt colors like purple and blue
    I dont know what to do......Plz help me.

  4. Jim Chambers
    November 4, 2012 at 7:20 pm

    If its a plugin card, try reseating the graphics card. Also check fan on card. If you use DVI connection to monitor try VGA or vis versa if monitor has DVI port.

  5. Jan Fritsch
    November 4, 2012 at 2:28 pm

    It sounds a lot like an issue with the graphics card. If you are seeing artifacts and colored dots especially in pink it is most likely the graphics memory.

    One would have to know whether it's a dedicated graphics card or an integrated graphics processor. For a dedicated card the easiest thing is to try another one.

    If it is an IGP it could be either the system memory which is usually shared with the graphics processor or an issue with the motherboard.

  6. Shankar C
    November 4, 2012 at 2:01 pm

    may be problem of RAM. Open the chassis and re insert it.

    November 4, 2012 at 1:33 pm

    Hello, the two most common reasons for this to happen are the following:

    -- Monitor is nor correctly plugged to computer. This could happen if it was moved a little bit or cables have became loose.

    -- Most possible reason having to do with the driver itself. It might be that driver became corrupted somehow. You could either try, update the driver or roll back driver from device manager.

    • Boni Oloff
      November 5, 2012 at 1:37 pm

      I think driver is a crucial thing to get updated. But many old VGA is not updated anymore. :D

  8. ha14
    November 4, 2012 at 12:02 pm

    boot on windows xp cd and use system restore point to revert back just before the accident.

    you can also remove the graphic card and boot on the onboard graphic card to see if the monitor still work.

  9. Aniket Singh
    November 4, 2012 at 10:17 am

    it may be problem of grafic card aur moniter,please attach another moniter,then see what happen if it aslo show the same thing then it's a problem of ur cpu or grafic card
    u should go to computer repairing shop coz its looking major problem......

  10. Boni Oloff
    November 4, 2012 at 10:09 am

    Maybe the monitor gets wrong, or maybe your VGA have some problem, try to check them.

  11. Erlis D.
    November 4, 2012 at 10:01 am

    I can say that this could be that the setup of the game it's broken (corrupted), or the game is buggy! What you have to do, is clean uninstall the game, and reinstall it again.. (Preferable with the setup you used and worked at the time it worked).
    The other problem could be from your graphics card! If the problem is the same for all games, or graphic related software; then it means that your graphic card might have some problems, and need to be cleaned, reinstalled the driver and probably the worst case, replacing it! Also you have to check your game compatibility with the graphics card model.. Sometimes, games are often compatible with specified graphics cards model. If you have some other details to give, please tell me, so maybe I can be more helpful!

  12. Anonymous
    November 4, 2012 at 9:26 am

    If you are having this issue before Windows starts (BIOS status messages are scrambled as well), it is most likely a hardware issue. If it is just after the boot loader gains control of the system, it is most likely a video driver issue in which case you can go the Device Manager, select the Properties of the video card and click on the Roll back driver button to restore the previous video driver, then reboot the computer. You should also do a complete scan for viruses and other malware since the "download" may not have been what was advertised.

  13. Yiz Borol
    November 4, 2012 at 8:35 am

    I would suggest making sure that the monitor (screen) is properly plugged into the tower (computer) and that the cable is snugly fit into the monitor itself. Sometimes it jiggles itself out and can cause ghosting and other weird things to happen to appear on screen.

    • Yiz Borol
      November 4, 2012 at 8:37 am

      If this doesn't work, your graphics card could be broken.

      (I wouldn't blame the kid, minecraft shouldn't destroy a graphics card, it could just be a lemon.)

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