Computer makes a loud clanking noise on startup

[pvknbd]

Ok so I had my computer on for almost a week now and everything was ok then I turned it off and went to sleep and turned it on in the morning today and as soon as I did it starting making a loud noise I'm not 100% sure how to describe it does not sound like some fan is hitting a wire or something just a loud noise now I'm not 100% sure where it's coming from I think it may be coming from the power supply because whenever my computer is on I can hear a slight ticking noise from the bottom of the case which is where the power supply is (atleast I think thats where it's coming from) I've had this same problem before but just holding down the power button and turning it back on again usually fixes the problem but this time after the 3rd time of holding the power button and turning it back on it stil makes the loud noise and I don't want to do it again so I was wondering what can be the problem and how can I fix it

[LightCode Gaming]

If you think its the PSU; take it out of the rig, hold it upside down, prop something to prevent the fan from spinning, and blow some compressed air into it. See if anything falls out or moves around.

[pvknbd]

I don't think its the dust some people say something about the bearings or something

[Juan Remes]

If you want to know if the problem is the PSU, just unplug everything, GPU, HDD/SSD, Motherboard, Fans, everything.

Now bridge the green with ANY black wire on the 24-pin cord of the PSU and the fan should start spinning.

 

at this time you could sort out if the PSU fan is the problem or not, if it is the problem, just RMA the thing

[pjm0925]

Is there maybe a fan that has a wire near it that's sometimes getting caught?