Noticed some weird sounds recently. Computer was having some issues so I had to transport them a few times physically in my car to shops. 
After the last time I transported it I can't help but noticing it has had a few odd noises. It does not happen frequently.

First two times was a little buzz sound. half a second long and I've so far heard it twice. 
Today the computer had a few weird sounds when I was starting up a game, it buzzed lightly for about 1.5 seconds. Also had a little clinking noise that sounded somewhat like when a Hard drive head is clicking.

Fans seem to be spinning normally, fan speed is all correct, I don't know of really any moving parts apart from fans and the hard drive. The sounds happen randomly and for such short amounts of time I can't pinpoint where they're coming from. Could the vibration and movement of the car have caused something to come loose? It was transported upright in the back seat within the Cases manufacturer box.

Someone suggested it could also possibly be the PSU, but I'm unsure as I can't pinpoint the problem.

I run a hard drive for just general misc stuff, and its for the most part empty so Its not as easy to troubleshoot as if it were the main boot drive. I'm running a long Seatools test right now, it passed all the basic tests.

Should I be worried at all? I don't see any wires near any fans either. 

Yeah... I'm listening to hard drive failure sounds online and the first two buzz sounds sounded definitely like a hard drive problem. The clicking sounded also definitely like a hard drive problem.
I'm running 4 Noctua NF-S12A fans and 3 Corsair fans, I don't think the Noctua's would get rattling from a few car rides, The Corsairs seem... fine. Two are radiator fans and I don't see any change in the way they spin.

And no, I don't think i've had any noticeable issues. The Hard drive passed all the simple tests and a long test through Seatools. If the hard drive somehow got physically damaged in the car ride, would a diagnostics tool such as Seatools be able to pick it up? 

Thanks for the reply, appreciate it! Using empty paper roll to pinpoint where the sound comes from is a great idea, been trying to figure out how to pinpoint the sound... 

Generally hard drives would be most susceptible as they have very fine needles and other small moving parts. It is hard to say if Seatools would pick it up. If there were some damage that occurred to large sector portions maybe but often times a physically damaged hard drive may not be picked up in a scan.
 
Besides the fans on a GPU most of the parts are not movable. PSU relays sometimes make a clicking noise and there is always the possibility of coil whine. But it doesn't sound to me like that is what is happening. Try to isolate the sound and let us know what you find.

Can you manage to get a recording of the sound? Is it closer to a constant high pitch chirping or a low electrical buzz?
 
If there's clicking the first thing I do is unplug fans until the noise stops. You can stop the GPU fan via software or just a finger very carefully & gently applied to the spindle, the only fan I don't recommend messing with is the one in the PSU. Since you are using a CLC system, when it is making the sound you might unpower the pump to see if the sound stops. At idle the CPU won't overheat for awhile, just don't leave it off for more than 20 seconds if your motherboard doesn't display CPU temps on the LEDs. 

Unfortunately I cannot get a recording of the sound because I can't replicate the sounds. It happens very rarely, I use my computer all day and i've heard these sounds in total 5 times on 3 separate days out of the past 2 weeks. 
I suspected the hard drive because some sounds sounded like they could be hard drive related, although the sounds I heard yesterday were semi-loud. 

The first two sounds I heard at first two weeks ago sounded like a thin wire brushing against a high RPM fan for a split second.
Yesterday I heard a low buzzing noise, it was also short for about 1 second. This happened when I was starting up Battlefield 1, so the CPU fans will be speeding up as well as the GPU fans. 

The clicking sound happened once. This ones a bit harder to explain what it sounded like. It sounded a lot like a hard drive head clicking once, but somewhat loud. 

What about the voltage regulation capacitors?  I never had this happen but in older times I heard / read some where having noise from them during a heavy load burst. 

Wooohah
Hard drives are always spinning right? Even if i don't have much data on it or when i'm not using it?
As long as it has power? 

I'm thinking i'll just unplug my hard drive and see if the sound continues, since it happens rarely I cant recreate the sound :/ 

Yeah, once unplugged, if you don't hear the sound again, you'll have your answer...

Nah it's not my system drive. It's basically empty.

I went ahead and unplugged it, gonna see for the next week if I hear the sounds again. So far nothing, which is a good sign. Rather have it be this hard drive than a fan, easier to narrow it down to one part than one of the 10 fans in this system....

No they're like small bursts, I'll hear the buzzing sound once for a second.

I know what coil whine sounds like, it's lower pitched than that. I know there's a bit of coil whine from my GPU when I start up really intensive programs, but it doesn't stop until i exit the program

Welp... Its not the hard drive. Unplugged the hard drive and I haven't heard the noise in a few days but I just heard it again today, so its most definitely not the hard drive. 

It sounds more a little buzz from vibration. It happens so rarely that I don't know which fan to even pin it down to, I have 2 fans on my radiator, then 5 case fans and a PSU fan along with 2 fans on my GPU... Since its literally happening once every few days, should I just ignore it until it gets worse?

My old case had a fan that vibrated really really badly and it was quite easy finding out which one it was since it vibrated on and off every day. 

Thanks, that's what I'll have to do then. If a fan breaks (granted its not the PSU or GPU fan) there's really no big deal there right? 

 Thanks man