Help with flickering monitor. I have tried almost everything.

[Gepost]

First, I have read most of the posts dealing with flickering monitors.

I have a workstation that is causing this problem. The monitor is flickering, both in the startup screens and in NT4. When set to 60 hz, all you see is the flickering from the low refresh rate. In bootup and when I change to a higher refresh rate, the monitor begins "shaking" the image.

I have done the following: Changed monitors, changed video cards, changed the pci slot for the video card, moved the monitor from the beginning location, moved the computer to another room, changed power supplies, changed power wires on both the monitor and tower, changed electrical outlets. The monitor I am using now is an NEC FV700. The monitor before was an Acer. The both support high refresh rates.

The key, I believe, is the fact that it does this shaking in bootup, including the bios setup screen. The only other thing I was thinking it could be, would be the motherboard. I am open to any and all suggestions.

 

[stockjock]

Just a guess...do you have some speakers near the screen? Unshielded speakers can cause this problem too. Just my .02

 

[altonb1]

Okay, to summarize, you have swapped the monitor with a completely different monitor, including the related cables but you still have the problem. Changing video cards also has not corrected the problem.

Did you try to reset your BIOS yet? You may have an erroneous setting for video in there that is causing your problem. (Video shadowing, assigning IRQ, etc.)

If that doesn't work, I would say that it must be the board.

 

[altonb1]

Okay, related to the speakers comment...when you say you moved the computer to another room, what did you move? Try moving the CPU, monitor, keyboard & mouse only. I assume you did not move the entire setup (printer, scanner, speakers or any other added equipment) when you moved it, right?

A magnetic field in the area could cause the problem, too. I think it could be a BIOS setting unless you moved it to another room and moved the problem along with it. Or...the board. maybe the BUS speed is set wrong and the video isn't able to support it? I'm just completely guessing at this point. Maybe you have an AGP port that is not fast enough for your card? I'm assuming this problem started happening w/o any known changes. (ie. You didn't add hardware and now can't figure out why it doesn't work)

Booting in VGA mode in NT results in what? Since you state that the system has the problem on the BIOS screens, too, booting to VGA modem probably won't help, but it might be worth checking out.

 

[Gepost]

Thanks for you suggestions. There are speakers, but they have been unplugged during most of my testing. Also, when I moved the tower (only the tower) into another office, the speaker were not a possibility. I also reset the bios to default settings, just in case that was a problem. I thought about updating the bios as it is a couple of years old. I still lean toward the motherboard, but will consider any other suggestions.

 

[Gepost]

I am going to bump this one more time for any other ideas.

 

[GregANDTCH]

The speakers could affect the monitor even if they aren't plugged in.
If they aren't shielded, they could be a problem.
Electrical lines can produce a magnetic field too.
(breaker boxes,etc.)
If you can find a compass, run it around and see if it picks up strong magnetic fields.
When a Degauss setting is used on a monitor, it shakes the screen alot.🙁

 

[Gepost]

I moved the tower to another office where there were no speakers, so that is out. I will try a compass if I can find one. I am still leaning towards a motherboard and will probably end up ordering one or trying a different one.