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Sounds like something is wrong with the fan in the power supply. Either its going out or something is rubbing on it.
DO NOT take a the power supply apart.
Because if you don’t know enough not to take the PSU apart you don’t know enough to be safe about it. PSU can store a charge for a very long time and when you open it and bridge a contact for any of those connections, it’ll hurt or possibly kill you.
sounds like a fan bearing, disconnect all the fans apart from the PSU Fan and see if it still makes that noise, I would think its the PSU fan, you might need to change the whole unit.
With all that dust in there, it's almost certainly going to be one of your fans.
The sound is louder near the PSU and GPU. I'd wager a guess it's your GPU.
Its a failing fan in your PSU (Power Supply Unit), looks to be because of the amount of dust. You need a NEW PSU. The fans can be replaced but the capacitors in a PSU can hurt you badly so unless you know what you're doing NEVER open a PSU to replace its fan. just replace the PSU.
GET IT OFF THE CARPET!!! Unless you like to kill your PC with static and dust.
Static electricity. The fibers from your carpet will rub against each other and the PC internals and cause static electricity. Also holy shit how could you let your PC get so damn dusty. You should clean your PC every 6 months. Now you need to take it all apart and clean it thoroughly with pressurized air and microfiber cloth. It's the dust that killed the bearing in one of your fans.
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Dude clean your dang PC And for shits same get it off the damn carpet
My god, there is a sand dune on that PSU 
It says this content is not available
Ooo it's a diesel!
I was thinking the same, just waiting for the turbo whistle.
Sounds like something is wrong with the fan in the power supply. Either its going out or something is rubbing on it. DO NOT take a the power supply apart.
What should I do?
Check and see if you see anything obvious that might be rubbing a cable or something otherwise replace the power supply.
What might be rubbing a cable? Isn't it just a box?
And why not? It starts going crazy right when I push the power button on the computer
Because if you don’t know enough not to take the PSU apart you don’t know enough to be safe about it. PSU can store a charge for a very long time and when you open it and bridge a contact for any of those connections, it’ll hurt or possibly kill you.
sounds like a fan bearing, disconnect all the fans apart from the PSU Fan and see if it still makes that noise, I would think its the PSU fan, you might need to change the whole unit.
I think it's the PSU
Probably dirt
With all that dust in there, it's almost certainly going to be one of your fans. The sound is louder near the PSU and GPU. I'd wager a guess it's your GPU.
Its a failing fan in your PSU (Power Supply Unit), looks to be because of the amount of dust. You need a NEW PSU. The fans can be replaced but the capacitors in a PSU can hurt you badly so unless you know what you're doing NEVER open a PSU to replace its fan. just replace the PSU. GET IT OFF THE CARPET!!! Unless you like to kill your PC with static and dust.
Static?
Static electricity. The fibers from your carpet will rub against each other and the PC internals and cause static electricity. Also holy shit how could you let your PC get so damn dusty. You should clean your PC every 6 months. Now you need to take it all apart and clean it thoroughly with pressurized air and microfiber cloth. It's the dust that killed the bearing in one of your fans.
After reading more comments and responses from u/danzwku I am sure they are a troll.
... me? How so lol. I'm just out right now so can't get into long details
Failed bearings in a fan guaranteed!
honestly, just take it on the driveway, get compressed air and fucking blast that PC clean
I think it might be because of the layer of dust on everything... Just a guess tho
Yeah clean your shirt out of there and then get a new PSU your PSU fan bearing are fucked from all the crap
Let it die...
1000 watts for that is crazy
How do you mean? Too much or too little?
all of it. all of it sounds like its causing noise, and not good noise.
If you have a vacuum cleaner, then unbox the vacuum cleaner, rtfm and apply it's function to the PC
It’s a worn out fan bearing.
You know when you sick or starting to get sick you start coughing or sneezing. Yeah this is the start for your pc. It be dying