Can Computers add noise to home electrical system

Actually the thought never occurred to me until I read this E mail from PS Audio. In my house the computer gets non stop action between myself , my wife, and my kids , so shutting it down everytime I want to listen to music will not fly, although certainly for demo purposes its a good thought. Plus my high speed internet comes via Cable so it does have a direct coax tie into my A/V system. I wanted to try it now, but my wife has the washing machine going. Guess advancement in audiophile science will have to wait.

In my home theater system the worst component is the dish network
PVR receiver with a hard drive. There is no on and off switch to turn the power completely off.If one pulls the plug reloading takes up to 4 minutes.It is kept on a different circuit.
The 24ooHzs new cordless phones and digital clocks, Flou lights and Halogen Lights. The list is endless.

Get dedicated lines, guys!

Aida , RE Read my post. THX

Darrylhifi - I did and it's rubbish what you read about computers causing problems in spite of dedicated lines for your audio. That would mean that your neighbours' computers and other gear as well would inflict your line because they all are sucking from the same transformer in the block. Not really. But: I used to have trouble even with my fridge coming on and causing quite some clicks while listening with gear on the same line. After installing two dedicated lines - one for the frontend and one for the amps - all that spooky stuff is over. That does NOT mean that I would not run f.e. PS-Audio PowerPlants which I do. But dedicated lines definitely are the first step to get rid of trouble caused by other gear in the household. And they are good value, too!
Thanx and good luck!