Hiya, earlier today i turned on my computer (lap-top) and after it started up the monitor made a strange noise, kind of high pitched, i was a bit worried and was going to re-start my computer, but as i was about to do this, the light in my bedroom starting going bright to dull (just a couple of times) then it went off and then the noise on the monitor stopped, is this just of case of..um..currency waves or something (is there such a thing!) thanks if you can help

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