Sam
Moderator
Premium Member
Registered: 24th Dec 99
Location: West Midlands
User status: Offline
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My monitor connects to both my PC and my MacBook Pro via HDMI cable.
I have either headphones or speakers plugged into the 3.5mm jack at the back of the monitor.
If I am using my MBP, I have no background noise or whatever even if no sounds are playing, but if I am using the PC I can hear a constant 60hz kind of interference/ground loop/whatever in the background even if everything is set to mute.
Even if I remove the HDMI cable and both MBP & PC are powered off, I can still hear this poxy noise.
The monitor is powered via an external AC adapter (16w I think) and into that plugs in a standard kettle lead. Tried different kettle leads, and even used my trusty universal AC adapter but the noise is still there. Even tried plugging into different wall sockets, and using different HDMI cables.
I have two questions; how can I fix this, and why does this problem not appear when I am using my MBP? 
I can get around this by just using the 3.5mm jack on the PC and not listening to audio via the HDMI, but I'm just completely stumped by this problem!
Ideas?
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