I am not sure what coincides with what but I will give a full description of what has been happening in hopes I can replace simple things on my computer.
This was a custom built tower from an ebay seller I bought almost three years ago, a little less than 1 1/2 years ago I downloaded Civilization V from Amazon.com and the next day I could not start up my computer because it would hang on the windows screen, when I unplugged my mouse it would no longer hang on the Windows start up logo and work but a knocking noise started at the same time. It was not frequent so I ignored it. Ten months ago, I replaced the graphics card thinking that may solve the issue and six months ago I replaced both my gaming mouse and keyboard and my windows no longer hangs but now I am getting blue screens, or my computer just shuts off and the knocking noise has persisted and has become worse. For the last six months it makes a horrible Brrrmm/knocking (not metalic noise) a few minutes after start up, then it would take longer for it to start knocking. The BSD I noticed coincided without the knocking noise, if the knocking noise was happening (and once it starts it does not stop, nor is it consistent; like not a constant thumping noise but starts and stops randomly) then my computer will run for hours, I have tested it and gamed with high graphics for 8 hours and the only thing I get is a delay which is my internet, but if the noise isn't happening my computer shuts down in less than ten minutes. Either a blue screen or it literally just turns itself off. Also another note, if I am googling things, not images and the pages does not have much to load the noise lessens, I still hear the Brrmm/knocking but it is quiet but when I load youtube or a video game the sound intensifies and the Brrmm/knocking becomes more constant and picks up noise when the game or anything I am loading on a page that is graphically intensive.
I took off the side panel of my tower and checked all my fans, they are not making noise, the noise is distinctly coming from the PSU and when it just shuts down, I have to use the manual power switch on the back of the tower in order to reboot my computer. From what I can guess, it is overheating, or maybe I am using too much power for the hardware installed. Also to note, the power box is hot to the touch. It hasn't melted any wires but I am concerned as to what is the issue and I can't find anything directly linking my problems with others. The fan isn't hitting anything, but since my computer shuts down when the fan doesn't knock I'm assuming the fan isn't starting and my computer is shutting down to prevent overheating or damage.
Is there is a way to check the wattage of all my hardware against what my Power Supply supplies? Why would the fan not start up at first? Does the power supply fan start up with power on or is it part of a boot order and starts later? Lastly, does my power supply need to be replaced, cleaned or fixed?
Here is the specs of my computer from a program I downloaded called CPU-Z:
Model: ATX ILS-500R2 500W Power Supply by Inland
(500W Silver Series)
Name: AMD FX-4100
Max TDP: 95.0 W
Package: Socket AM3+ (942)
Specification: AMD FX-4100 Quad-Core Processor
Manufacturer: BIOSTAR Group
Chipset: AMD 780G
Southbridge: AMD SB700
LCIO: ITE IT8728
Brand: American Megatrends Inc.
Link Width: x16
Max Supported: x16
Channel #: Dual
Size: 8 GBytes
NB Frequency: 1999.9 MHz
Name: NVIDIA GeForce GTX 750 Ti
Board Manufacturer: EVGA Corp.
I probably posted too much info, but I have always noticed people do not post specs to their computer and are always asked for it to answer the question in depth. If this seems to be more a software issue then I will ask this in a different forum as I am assuming it is a hardware issue so here I am. I also have detailed diagnostic reports I know how to get from the performance monitor where I can see (but not understand) all the critical errors. I am aware I may have a whole host of problems but I do thank you very much for your time, anything additional I need to add I will do.