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Weird audio and video interference

At around 9am this morning while I was playing an online game, my speakers made a buzzing noise (it sounded like it was moving from right to left almost) and my screen made black lines (not dead pixels, almost like a CCTV camera feed)... I looked at my second screen to see if it was doing the same, and I saw a figure that looked like a man moving from one side of my camera's monitoring window to the other side (I was in a skype call with someone at the time) ... I immediately got up and asked people in the house if they had experienced interference on their devices. They said they did not...

I was running camera feed through ManyCam using my android phone LG 3 Beat.
Using AMD Radeon R9 200 Series GPU.
Using 1920x1080 HP V241a monitors.
Using KRK Rokit Sub and Speakers running through a Scarlet 2i4 external sound card.
I am using a 2mbps ADSL connection.
I live in Cape Town, South Africa.
My ISP is Telkom.

I would appreciate any information or comment on what this could have been, as I am scared out of my pants...

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Comments
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So is this your first computer crash?

I read it twice and it sounds like one of the typical crashes. Hopefully a reboot clears it up.

That out of the way you will find folk that want to know why it happens. If you ever find the cause, let others know as they want to know too. So far such seems to be bugs in software and hardware. For reasons of economy, not all things are perfect.

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This was not a crash

The speakers made a buzzing noise and the screens were acting out.

My PC did not stop working. It seemed like something was interfering with the peripheral devices. Similar to what happens when speakers pick up the signal from a cell phone when the cell phone receives a call.

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I've seen such happen on a PC glitch and crash.

Having seen such before, it doesn't sound like anything new.

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creepy

what's really creepy is when you drop a video and the picture is gone but the sound keeps playing till the end. Shocked

and then it says;

"WOULD YOU LIKE TO PLAY A GAME"?

that's when the last thing you hear is the sound of my slamming screen door.

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Indeed creepy

I am not someone who assumes weird things at first, but this made me jump out of my seat.

Even if you forget the figure I saw, simply the interference on my speakers and screens was weird and out of the ordinary enough to make me a little uneasy.

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Stock up on holy water.

And if any heads start going 360 degrees, run like hell!
Dafydd.

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