1. Computer problem? Tech Support Guy is completely free -- paid for by advertisers and donations. Click here to join today! If you're new to Tech Support Guy, we highly recommend that you visit our Guide for New Members.

Solved: Fuzzy snowy dots and lines on screen

Discussion in 'Hardware' started by paulb100, Jan 10, 2013.

Thread Status:
Not open for further replies.
Advertisement
  1. paulb100

    paulb100 Thread Starter

    Joined:
    Mar 17, 2005
    Messages:
    1,874
    Iam looking at a PC for a friend and it has a symptom ive never come across before, I recently installed an extra stick of 512Mb into the old XP PC so it now has 1Gb, it worked fine while I had it but a few days after he got it back it started to have the following problems after 15 minutes of use.. snowy scrolling dots appearing on the screen, akin to interference... the computer would also reboot in a loop... so I asked him to bring it back.. when he got it here it worked fine for 90 minutes and I used Memtest+86 to scan the RAM which came back as Zero errors..it was when I reboot the PC after running Memtest+86 with the reset button that it all started..

    it seems to be some interference of some sort, possibly? - maybe it needs to 'warm up' before it happens? I dunno, I can only speculate.

    if anyone has any ideas what this may be I would appreciate it..

    EDIT: I should say that I used my own monitor so its not that.

    photos:

    [​IMG]

    [​IMG]
     
  2. dai

    dai

    Joined:
    Mar 6, 2003
    Messages:
    11,198
    what are you running
    video card brand and model
    cpu
    m/board
    ram
    power supply
    brand
    model
    wattage

    check the listings in the bios for 12v line voltages and temperatures and post them

    reinstall the video drivers

    maybe failing video card or chip or power supply
     
  3. Tanis

    Tanis

    Joined:
    May 29, 2006
    Messages:
    3,969
    First Name:
    Shane
    Agree with dai, a likely cause based on the pictures and your description would be a failing GPU or possibly the PSU. The fact you are showing pictures of the problem in the BIOS scneens and other area before Windows has started is a good indication of a hardware problem not a software one as no drivers etc have loaded at that stage.
     
  4. paulb100

    paulb100 Thread Starter

    Joined:
    Mar 17, 2005
    Messages:
    1,874
    its an ancient PC, I replaced the MOBO in it 7 years ago and it was old then lol...

    Intel Celeron 2.6Ghz
    1Gb DDR1 RAM 400Mhz (2 x 512Mb)
    unsure of mobo brand, PSU brand
    GPU is SiS built in.

    do the voltage levels look ok..?

    11.95
    5v
    3.25v

    this only seem start after inserting the 2nd stick of 512Mb RAM (but it tested ok) , It seems to happen after the computer is on for a bit and then when you reboot afterwards it starts....

    I have tried the original 512Mb stick in both ports... the problem does not arise, I have tried the new stick in the 1st port on its own and problem doesnt happen, Ive yet to test it in the other port - if all ok I will insert them both in together again and retry...

    I didnt think it would be possible for RAM to cause those symptoms...is it?- its defo a hardware issue that much is for sure..


    thanks
     
  5. dai

    dai

    Joined:
    Mar 6, 2003
    Messages:
    11,198
    take the side off the case and look at the psu label for the details

    the 11.95 is down but i would not think it was low enough to cause the problem unless the 12v line amps output was low to start with

    see if you can borrow a older video card with low power demand to try in it
     
  6. managed

    managed Trusted Advisor Spam Fighter

    Joined:
    May 24, 2003
    Messages:
    13,153
    First Name:
    Allan
    Looks like Ram to me, especially as it's using on-board Graphics which will use some of the Ram.

    Try running Memtest86+ for several passes with all possible combinations of ram sticks and sockets.
     
  7. paulb100

    paulb100 Thread Starter

    Joined:
    Mar 17, 2005
    Messages:
    1,874
    ppffft! talking work for days on end too do that lol!! - wouldnt be so bad if it wasnt a bloody hair dryer that makes an immense racket because the CPU/Mobo doesnt have variable speed fan so its at 3500rpm and the PSU fan is even worse.. the 12v was 12v dead on last night.

    I put the sticks back in and had it running scans and stuff for hours and it never happened once - it has not happened since removing and re-seating memory - heres the thing though, if its a bad seated memory...how would it cause static type interference on the screen? I can understand the crash/loops but not the static snow drivelling down the screen... it seemed like electrical interference, it wasnt fixed location dots like, I know the RAM is used to store GPU data but could the data corrupt in such a manner that it has snowy dots rain across and down the screen?

    anyway - fingers crossed it sorted, I have a spare PCI-E GPU with passive cooling, old thing.. if it happens again I will try that,

    I also removed the floppy drive and an inactive DVD-Rom (leaving a CDRW in) so less power is drawn from the PSU

    thanks again :)
     
  8. managed

    managed Trusted Advisor Spam Fighter

    Joined:
    May 24, 2003
    Messages:
    13,153
    First Name:
    Allan
    Yes a ram problem could cause that sort of thing. When it's read to put the data on the screen any errors could show up as dots/pixels of the wrong colour. Looks like re-seating it fixed it though. :)
     
  9. Sponsor

As Seen On
As Seen On...

Welcome to Tech Support Guy!

Are you looking for the solution to your computer problem? Join our site today to ask your question. This site is completely free -- paid for by advertisers and donations.

If you're not already familiar with forums, watch our Welcome Guide to get started.

Join over 733,556 other people just like you!

Loading...
Similar Threads - Solved Fuzzy snowy
  1. winpc
    Replies:
    1
    Views:
    1,397
Thread Status:
Not open for further replies.

Short URL to this thread: https://techguy.org/1084627

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice