Bad monitor or bad video card????

[goombawaho]

Here's the deal. LCD monitor connected to a client's Emachine. The video goes all yellow and then returns to normal periodically. I don't know if LCDs behave like CRTs in that if one of the guns die (yellow/red/blue) causing this condition or if it's the video card.

Then the entire screen went black. Turned off the monitor and turned it back on - it said "NO SIGNAL". Could not get it to display anything.

What I tried:
1. Checked cable connecion at PC - no change
2. Wiggled cables at both ends - no change
3. Plugged my laptop into monitor - monitor works
4. Turned off PC, plugged monitor back in, start PC - monitor works

So, I don't know if it's the monitor going bad or the video card. I don't think it's the cable. So, I updated the video driver and told the lady to "see what happens".

Any opinions or other troubleshooting steps to determine the real issue?? I'm leaning toward the video card (it's an Intel integrated 82856G).

 

[ski]

A "No Signal" warning usually means that the monitor is not receiving a video signal, which in turn points to either a bad monitor port, a bad PC video port, bad cable, or bad video adapter.
If the problem reoccurs, then suggest that the monitor's video cable be replaced with a known working cable, and then run it for a while. If the problem stops, then the cable may be the cause.
If the problem reoccurs in the above, then connect the monitor to a different system, and again run it for a while. If the problem does not reoccur, then the video adapter may be bad.
If the problem reoccurs in the above, then the monitor or its video port may be bad. If the monitor has both analog and digital ports, then connect it using the other port. If the problem stops, then the first port may be bad.

 

[goombawaho]

Only one video port on the monitor - analog
Cable cannot be replaced - integrated into back of monitor
No other system to connect it to other than 5 minutes on my laptop.

What's the difference between the PC video port and video adapter - aren't they one the same for all practical purposes, since one cannot be replace without the other being replaced???

I suppose the cheapest thing to do is throw in an old video card to see if the problem disappears.

 

[ski]

PC video port = video adapter
Installing an old video card is another troubleshooting method.