Need Help on Screen Flicker - Horizontal Lines

Hi All,

I recently changed my PC (except for the monitor) and now my monitor has 2 flickering 1.5” horizontal lines. It starts at the bottom and moves up or sometimes the opposite. I’ve also noticed that the time for a line to complete its travel varies from 3 to 5 seconds. The lines are constantly there: desktop, games, movies, etc.

At first I thought the lines were caused by the onboard graphics card of the motherboard. But I just upgraded to an HD 4670 card and the problem is still there.

I didn’t have that problem on my old PC, even if it had a heat problem and sometimes crashes. My old PC was a P4 2.8ghz with an AGP 6600GT graphics card. Also, I can run my monitor at 70-75Hz with that PC. And now my new PC can only run it at 60Hz. I’ve read that my monitor can only support 60Hz at 1440x900 but how did the A6600GT manage to reach 70-75Hz?

Here are the details of my new PC:
I know it’s not “new” new. But it is a “new” hand-me-down. =)

ViewSonic VG1930wm @ 1440x900
Intel Board D946GZAB --- updated drivers from Intel site
Intel Pentium(R) D 3.00 GHz
1GB DD2 667 RAM (1 stick)
ATI PCS HD 4670 512MB ----- with Catalyst 10.6
Seagate HD 40GB

Windows XP SP3
DirectX 9.0c
BIOS Version: AB94610J.86A.0140.2006.1213.2204
BIOS Date: 12/13/2006

I also downloaded the Intel Desktop Utilities and it shows:

Processor Temp : 57 C
Sys Zone 1 : 42 C
Sys Zone 2 : 45 C

Processor Fan Seed : 2526

+12 Volts : 12.000 V
+5 Volts : 5.133 V
+3.3 Volts : 3.300 V
Memory Controller Hub Vcc : 3.151 V
Processor Vcc : 1.212 V

I apologize if I included irrelevant information here. I just wanted the information to be as complete as possible.

I appreciate the help! Thanks in advance!
12 answers Last reply
More about need screen flicker horizontal lines
  1. sounds like bad connection to me. possibly a bent pin on the monitor cable or a problem with the monitor itself. if the cable is replacable try a new monitor cable or with a different monitor if you can get ahold of one to verify before buying one
  2. Thanks for the reply. I just finished connecting the monitor to my old PC, started BIOS and there are no flickering lines. I even connected my monitor to a TV Tuner and also, no flicker.

    Does this mean that it is not because of the monitor cable or pin? Can this be because of the motherboard? As the flicker was already there when I was using the onboard GPU and was still there even when I changed to the HD 4670.
  3. Bump!

  4. Anyone?
  5. You might try using a lower resolution. It may be drivers for your monitor that are the issue (sadly, it's likely very old and it may be tough to track down).
  6. Thanks for the reply.

    I just connected my PC to a crt monitor and there was no flicker.

    So can I assume now that it is not a power supply issue? Because what I have is a generic 500w PSU. I doubt that it can even reach 400w.

    I've read that there is a compatibiliy issue between ViewSonic and ATI graphic cards. Would this be the case? Because as far as I can tell, I have all the updated drivers. Would formatting and installing a fresh copy of Win XP help?
  7. I just upgraded my generic PSU to a Silverstone ST-50F Essential 500W 80+ because I've noticed that my 12V drops to 11.68 when under CPU+GPU load. I've noticed this when playing SC2 & DDO, causing my ATI to restart.

    And now I'm surprised that there are no flicker anymore! =)

    Can anybody explain why?

    Thanks for all the help!
  8. I'd assume that your system was becoming underpowered and then not being able to fully utilize the graphics card.

    On a side note, I have that PSU, Its awesome :P
  9. I can now play SC2 on high settings while DDO on the highest that I can get. However my Linksys WMP54G adapter gets lag spikes while playing DDO or SC2 every 5-10 seconds. And after a while, it totally loses connection.
    It will then start scanning for a connectin, finding one, then gona lose it again then restart the whole process until I turn the Wireless Monitor off, turn it on, and connect using my passphrase.

    I didn't have any problems with my adapter or my connection before I upgraded my PSU.

    Help! I can't advance my SC2 ladder! :)
  10. This topic has been closed by Mousemonkey
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