new pc strange sound

Dec 20, 2018
I bought a new pc which was custom made, after a few days i get a sound coming from the pc, its random maybe every 8-15 minutes, my pc is on a wood floor the sound is like a vibration, or like a runner sound on a cheap wardrobe it lasts a second or fractionally more, i can hear it clearly in a quite house with background noise its audible but not so dramatic,

I have contacted the supplier they think its a psu sound and will take it back to have a look, i use the pc for work, sending it back is inconvenient the sound is annoying, i have tried different electric sockets with no difference, so my question is could it be a faulty power lead the pc was expensive and has sound proofing, are these sounds something i should accept.... ?? any help would be great, I am not technically minded thanks David
Dec 20, 2018
i can not tell where the sound is coming from, the pc has an ssd which is half full the 3tb hard drive only has a few files, the pc is on the floor with the panel open i have tried to listen but can not pinpoint the sound, the pc company have said it probably is the psu but i can not be certain if thats a fact, it make the sound while just surfing the www, and does not increase when playing a game as an example, the graphics card is a nvidia 1070 the fans on this are not spinning, the pc company say this is normal and will spin only when required ?? the spec is below

Motherboard Integrated 10/100/1000 Ethernet Lan (Broadband Ready)
Built & Tested CP
3 TB Seagate (3000 GB) SATA-III HDD 7200 RPM 64MB Cache
Cooler Master 750W (Modular) PSU - Low Noise
Black ATX Silent - Ultra Quiet (Sound Proofing Included) - Built In Card Reader
Sound Blaster Audigy FX 5.1 (PCI-E)
1 x 2 Metre UK Mains Power Cable
Corsair Hydro H80i V2 (Advanced Liquid Cooling)
Microsoft Windows 10 Home 64 BIT
FREE - Gaming Headphones (FREE FOR ALL ORDERS BEFORE 11:59PM ON 27/11/2018)
NVIDIA GeForce GTX 1070 - 8 GB - (PCI-E) - DVI/DP/HDMI - HD/4K/VR - Supports 4 Monitors - BLACK FRIDAY SPECIAL LOW PRICE
512GB Samsung PM981 M.2 SSD, Read 3000MB/s, Write 1800MB/s - Silent
Intel i9 - 7900X Extreme (10 x 3.3 GHZ - Turbo 10 x 4.3 GHZ)
Asus TUF MARK 2 (Intel X299) - 6xUSB3.1/4xUSB2/RGB
32GB 2400MHz (2x16GB) - Lifetime Warranty (DDR4)
FREE - UK FedEx Delivery
Express Delivery - Before 6:00 PM
3 Year Standard Warranty (2 Year Collect & Return)
Built & Tested - 9 Working Days
Included - Original Packing Wanted