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Quick update, as a test we stripped out the earth from an extension lead, plugged laptop and monitor in and hey presto problem resolved. Obviously this is not a solution but at least we have isolated the issue. Any ideas what this means and if this changes your thinking on how we can resolve it?

Just to clarify, we get the problem with both laptops. If we pull one laptop lead out, the flicker/interference disappears from one monitor but doesn't affect the other If we turn one laptop off the other monitor still shows interference We have tried alternating different sockets, and leads...

We have tried another laptop and a different monitor but get the same problem so it's unlikely to be the laptop. As for the isolating transformer, where would we get one and what are the likely costs?

Yep done that, but still the same problem

Erm, not sure. I have no idea of electrics so don't know if they are on different phases. How would I tell? Thanks for your response.

Hi, I'm having a bit of a nightmare. I'm really hoping you can help We're a small business just moved into an office. We have two laptops connecting to external monitors. Both are the same model laptop (HP DV2530ea) and both monitors are the same (Dell ST2410). The monitor screens flicker like...