Monitor goes black when my dehumidifier turns on?

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boulderingislife
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Anyone have any idea why my monitor goes black for a moment when my dehumidifier goes on? Does that mean my PSU is insufficient, or is it an issue with the graphics card or something?

I have two monitors and it looks like the one connected to the third party graphics card is the one that is affected. Screen connected to internal graphics card is unaffected.

Thanks!
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LuigiMario
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Dehumidifier is basically a fridge; does it make a rattling sound when it starts (compressor/motor)? or is it mostly silent (peltier heat pump)?

One of them, compressor, takes a big amount of current to start, that could remove a whole cycle of the mains, hence drop the mains for 20 milliseconds (0.02s) or so, one of your monitors internal psu’s might drop an internal supply for a brief period - due to insufficient capacity, or an inability to handle spikes and transients that sometimes are radiated and conducted when a heavy load abruptly switches on.

It’s prob not your PC or GPU, but I’d add a dedicated PC mains extension block with surge-suppressors (metal oxide varistors) plug PC & monitors into that, and plug the dehumidifier system into a different mains outlet.

Make sure all mains cables and the dehumidifier are CE marked, and good quality. Some modern mains cables are very lightweight compared to those of 20yrs ago, manufacturers saving copper = magnification of disturbance effects, potentially.

Tighten-up the screws if any on the vid cables, vga, hdmi, display-port, unplug them (when off) and re-plug them, to ‘clean’ the contacts.
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Gofre
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(Original post by boulderingislife)
Anyone have any idea why my monitor goes black for a moment when my dehumidifier goes on? Does that mean my PSU is insufficient, or is it an issue with the graphics card or something?

I have two monitors and it looks like the one connected to the third party graphics card is the one that is affected. Screen connected to internal graphics card is unaffected.

Thanks!
Switch the video outputs that the monitors are connected to. If the other monitor now dies, it may well be something internal, if the same monitor dies then it's likely to be the power source (which seems more likely).
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