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I had to replace video card on SO's PC with Sapphire X1650 Pro AGP and now picture on Viewsonic PT813 slightly vibrates. I normally don't use that PC, so that could have been there with old video card. Is it possible to fix this?

I've seen this before, but it's usually caused by something like a cheap desk fan being on in the vicinity.

Mooooooooooooire.

Do LCDs even have moire? I think this one does.

Look for electrico-magnetic interference basically. DC wires seperated, magnets in speakers/motors. Also check your ground/power line quality.

Also make sure the connectors at good at the monitor and pc for the cable.

Could be the refresh rate, try changing it to 60 in your display properties (under adapter).

All LCD's should be set to 60 in the display properties.  There isn't really such a beast as refresh rate on an LCD (and shouldn't be an issue with a DVI or HDMI connector, digital signal - you know?) but could be an issue with an analog (i.e. VGA) signal...  Usually you won't even get an image though.

edit:  Okay, Viewsonic PT813 is a CRT.  My bad.  What I said still holds though just, you know, for an LCD.  In other news, DeGauss button, press it and check cables for being close to, or on same line as, an induction motor.

Try changing the Degauss, Moire and Convergance settings. Also check that you are running 1600 x 1200, at 85Hz refresh.

no luck so far

Whack it!

Are you close to a trolley or electric bus line?

Also try dropping the resolution.

First thing I did. Nope, I'm not near any lines/strong magnetic fields.

Do you have another vid card to swap in or another computer to put that one in?  At this point I'm guessing hardware issue.

Try the monitor on your computer in the same location if possible. Also use the same video cable if possible assuming it't not built into the monitor.

I've been reading about some setting in the ATI drivers related to weird output on LCDs (messes up 1-to-1 pixel mapping or some such)  but I didn't pay much attention to it because I avoid ATI cards like the plague these days. If I can remember/find out what that is I'll let you know -- it could have some impact on the analog CRT display quality as well.

I think I will try monitor on my main rig, problem it is so massive its huge PITA to move it.

Move the computer?

Miles of wires that are tangled mess to reconnect, you actually need to move my desk to have a go at it.

Most cases I've seen of screen vibration were a bad cable or connection.

I've seen bad cable/connection, low power from the wall (try it with a/c off ;)), and dying monitors. My poor 21" CRT was on its last legs when I got the hdtv, and the upper corner was doing some weird vibration thing.

We have a bunch of unprotected cables in the walls in my office. It causes any monitor near a wall to vibrate like this. What I found is a quick fix is to up your refresh rate to around 85 or 90. Give that a try and see if it works for you.

Could be as simple as the monitor cable running paralell to an AC power cord. That situation is the one in which you will get the most interference in a signal from a power cable.

Used to have to make sure the lighting dorks had not run power cables along side mic cables when I was helping out with audio stuff in college as even the most heavily shielded cable is susceptible to interference when 20 amps of 110v AC is zippin by right next to it.