Looks like burnt up or slightly melted styrofoam to me. Hard to say for sure though. Is it easily removed or is it sticky/viscous?
That's what I thought too. It wasnt very sticky but I had to use a brush to remove it. My computer runs at very high temperatures (90 degrees celcius) most of the time and maybe that could be the reason for the melted the Styrofoam. But why is it leaking out of the fan pipes?
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