[Rastinny]

Greetings
I seem to have a simmilar problem connecting my dell latt and sony viao to a PA. Howling noise of hard disk and other electrical noise goes comes trough as soon as the jack is pluged in the laptop. The noise reduces in loudness when power cable is plugged out the laptop and it is running on batteries but the sound stays bad. No problem with a pc or with any other devices. Asked in sony shop and have been adviced to buy external soundcard. The external sound card is plugged in to the usb drive but this does not remove or reduce the noise at all. As soon as the jack is plugged into the external sound card the noise reappears. I have not tried to connect the external SC though optical connection to the PA because my PA has no opttical input. I was also suggested to buy a special extension lead that is supposed to 'ground' better but have not yet tried it. If any of ye have an Idea or have the same experience (specially DJ's) I'd be grateful if ye would share this.

All blessings,

Rastinny