Tecra M5: External monitor flickers - grounding issue?

Hi,
I just bought a new Acer Full HD LCD Monitor (P244W) and have tried connecting it to the VGA port of my Tecra M5.
It works, but there's a noticable and increasingly annoying flickering. I tried it with both XP (SP3) and now Vista (SP1) and it happens for both. I have the latest BIOS and NVidia drivers. The actual laptop LCD screen still works fine, its just the external monitor that flickers.
To ensure there was nothing wrong with the monitor, I connected it to the VGA port on the ATI video card on my desktop pc and it displayed fine without any flickering.
After browsing the web for people having similar problems, I've narrowed it down to it being caused by my AC Adapter having a grounding problem as the flickering dissapears as soon as I disconnect the AC Adapter and just run from the battery. It the seems the common solutons to this problem are:
1) Try some different VGA cables with better shielding from interference.
I tried this and it made no difference. I tried cables both with and without the ferrite magnet/choke thingy's at both ends of the cable and the flickering remained.
2) Try different screen resolutions and refresh rates.
Tried setting some lower resolutions, but the flickering remained (besides I'd rather keep the 1920x1080 native resolution for my monitor). The NVidia driver only allows 60Hz for the refresh rate at 1920x1080, so I couldn't change this.
3) Ensure both the laptop AC Adapter and the monitor are connected to the same wall socket and are on the same power extension board.
Tried this, but didn't fix it.
4) Run an extension cable to another power circuit in my house and power the AC Adapter and monitor from this to see if its something wrong with the wall socket im using.
Tried connecting to a wall socket in my laundry, but didn't fix it.
5) Try using a different power extension board and ensure nothing else is connected on it other than the AC Adapter and the monitor.
Tried this, but didn't fix it.
6) Get a 3 prong to 2 prong adapter, so the AC Adapter is no longer grounded.
Most people on the web seem to say this fixes the problem, but I'm not sure how safe it is to leave it this way in the long run. Especially, when stories of laptops catching on fire are becoming more common.
7) Get a generic brand AC Adapter as these sometimes deal with the grounding problem better than the Toshiba AC Adapter.
Again, I'd rather avoid this option as even the generic branded ones are expensive.
8) Remove the battery and run from the AC Adapter on its own.
Tried this, but didn't fix it.
9) Fiddle about with the monitors settings.
Tried this, but none of the settings fixed it.
So, what are my options?
Is there a known cause & solution to this problem?
If my laptop is still under warranty, can I get a replacement AC Adapter or something to workaround this problem?
Thanks
Message was edited by: shaneh20
Message was edited by: shaneh20

I finally figured it out. Just for laughs and because it was the only thing I hadn't tried, I tried using a different 3 prong power cable that I had lying around, connected it to my monitor and the flickering dissapeared. *So, the power cable that came with my Acer monitor was dodgy and not my Toshy's AC Adapter like I first thought.*
I'm guessing the dodgy power cable was preventing the monitor from grounding properly, so instead it tried to ground itself using my laptop's power cable, going via the VGA cable
. This would explain why the problem seemed to go away whenever I unplugged my laptop's power cable and also why there was interference.

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