This is what I have heard on Hi Fi and I am not offering explanation as to "why".

Different power cord do sometimes make the equipment sounded differently. I used the word "differently" and did not use the word "better".

To hear this differences, you have to plug it into higher end (read....expensive) equipments. Very unlikely to hear any different in low end equipment.

I believe some of us are running display devices (projectors, tv and such) that are of the expensive kind. Money are spent on better inter-connect, surge-protection and such, but do we leave the power cord out of this upgrade?
In the source and audio section, we upgrade the power cord along with the inter-connects but why we leave out that one link in the display devices?
As "some" of us do "hear" difference on audio, do the same "difference" can be obtained with power-cord upgrade on display devices? That is the question remains when upgraditis strike, do we upgrade "that" display power cord?

tried to use an upgraded power cord for my mid range system before....no difference ...but maybe i just don't have a good ear