Originally Posted by RockvilleJ
I will swap out the power supply tomorrow for a smaller one that I know did not interfere before. As for the third wire ground, couldn't I use an electrical current testing tool between the hot wire and the ground wire to check out the continuity? If the ground isn't good, then the circuit won't be complete, right? I believe plugging the pc into another outlet, even on a different floor would still eventually go back to the issue of the ground in the main panel box. How would I now if the ground was not proper in the main panel box?
But if it was a loose ground wire in this particular outlet, then it would make a difference. Anyhow, I'll try out different outlets on different floors with an extension cord.
Regarding the video card, this is the 2nd one that I have had in the pc and changing it out when the first one died, didn't alter the interference and putting a different card in there would be problematic since it's a newer type slot for which I don't have any extra cards lying around. But I'll keep wrestling with the issue.
Plugging the PC into a different outlet will prove if your outlet has a missing or loose ground connection, You are correct, It will not prove that main power panel is grounded correctly. A tester would probably prove an outlet had a totally missing ground, but might not catch a ground wire that is just loose and not connected tightly.
To prove a main power panel is not grounded properly, is really an electricians job. You want to know how to do things safely there. Sometimes a ground wire will loosen up there especially if aluminum wire was used. Aluminum tends to give problems like this, but it is used because it is cheaper than copper wire. It is normally just a matter of tightening up the big screws on the ground wires there, but again, you do not want to make a mistake there or you will get burned or even killed.
If your two video cards were of a different
manufacturer, and you had the problems with both of them, then I would not think you have a video card problem. But if both cards were from the same manufacturer, then the video card is still a suspect. If both cards were the same model, you could have a manufacturers design problem and you could swap 10 of them and still have the problem.
I still suspect the power supply, but really it could be anything in the PC.
Yes, even a case fan. Not likely, but it does happen.
It could be memory, disk drives or a mother board. I would not suspect any of them, but it sure is difficult to troubleshoot it from a distance. CD or DVD drives would not be a suspect, but unplugging the power on them and booting the PC will prove if they are the culprits.
Try moving the various cable around. Make sure they are not tied together very tightly into a bundle.
Could it be a Cable or DSL modem that you are turning off when you turn the PC off? Anything else that gets turned off when you shut down you PC. Like a printer or scanner??? Or even a digital clock.
If you are not using Wi-Fi, are you using "power Line Networking"??