Screen Flickers when connecting USB

Hi Guy

I have been working all day today and noticed when I plug in a USB device that HAS external power my external screen that my MBP is connected to goes off off a split second or I will get a kinda "White Noise" pic.

It happens everytime I plug in a USB device with External Power... HDD that don't require external power seem fine.

Any ideas?

Hay

nickandre21 said:

I think you should get this checked by Apple if you are still in warranty, something seems not right it should not do that. Im guessing you tried other externally power drives as well

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Exactly the same thing happened to my friends mbp using the same USB device, only flickers when connected to external display, unplugging the display and the USB is fine.. I'm thinking its either my external screen or the USB device