Strange buzz when hdmi plugged into pc

[ozstar]

Hi,

When I plug the hdmi cable into my laptop PC to the venue screen, the foldbak speaker has a hum.

Have changed all leads and power points but it still buzzes as soon as I plug the hdmi in.

Very weird and wondered if there was any suggestions we have not thought of.

Thought it was a earth ptoblem butnot sure how to fix it.

The speakers is fine without that cable.

Thanks

oz

[dee99]

Did you try it with the laptop running on battery only? If it is quiet on battery it could be something to do with your laptops power supply.

[PhilVale]

I get something similar (a crackling rather than a hum) with my laptop when plugged into docking station which also provided power. Works fine either not on the docking station or if not plugged in to power at all. AND it's not an SCS problem as it accects other audio as well.

[ozstar]

Thanks guys.
I will try the battery power only to see if that affects it.
Also after research found a few small gizmos which may help.
Will post the results.