PSU fan whining, random reboots and overheating

[Jesuil]

My PSU is making a high pitched whining noise, and sometimes a grinding noise. The fan seems to spin slower than normal, or not cooling the psu properly.
My pc reboots by itself after a while of having it on, and motherboard temperature goes to 60c-65c just on standby, without anything extra running.
This pc is around 4 years old and I am trying to figure out which part could be the problem, and being on a budget, the most affordable way to get it fixed or parts replaced.

My pc specs are:

Intel Core i5 2500K @ 3.30GHz
8.00GB Dual-Channel DDR3
ASUSTeK Computer INC. P8H61-M LX2 (LGA1155)
2047MB NVIDIA GeForce GTX 950 (EVGA)
931GB Seagate ST1000DM003-9YN162 ATA Device (SATA)
Windows 10 Home 64-bit

Any help or ideas much appreciated, thank you in advance.

 

[Dark Lord of Tech]

What PSU?

 

[Jesuil]

600w ATX Power Supply ATX-CP600w
(So sorry to leave out the obvious part, that is all it says far as I can see.)

 

[Dark Lord of Tech]

Make and model?

 

[Jesuil]

I think it's actually from Xtreme gear, the psu...just read a lot of bad things on it.

 

[Dark Lord of Tech]

I wouldn't run that PSU on any setup , very poor quality.

 

[Jesuil]

Would you be able to tell me, what I could replace it with that would work for my specs? I am kind of a newbie in this area.

 

[salerhino]

Would you be able to tell me, what I could replace it with that would work for my specs? I am kind of a newbie in this area.

Any tier I or II http://www.tomshardware.co.uk/forum/id-2263985/power-supply-tier-list.html
And for wattage I can tell you that 500W is enough for your build