Okay, firstly I'm not 100% sure the psu capacitor exploded. However, all signs point to that being the case.
I was using my pc when I heard a loud popping sound, and shortly after smoke came out of my pc alongside a bright light inside the case. The pc was still working after the pop and I shut down my pc after a few seconds through windows shutdown. The shutdown process normally takes around 10-15 seconds for me and the computer started smoking a lot during shutdown. I disconnected the power afterwards.
The fumes smelt bad (and I assumed it may be toxic) so I opened the window and left it for around 20-30 minutes. I came back and opened up the case and took out a couple components. The smell was mostly gone so it was difficult to know for sure, but I "think" there was a similar but really faint smell coming from the power supply. The smoke and/or light was coming from an area below the graphics card. After a quick inspection of the graphics card and motherboard, the capacitors seem okay (again not 100% sure but it seems okay to me).
The PSU is a Corsair RM750 750W 80 Plus Gold Fully Modular and I've had this pc for almost 2 years now. I have a couple questions. What are the chances that other components are fried? I intend to get the PSU replaced and testing out the system to see if it works before replacing the other parts which leads to my next question. Assuming that the other parts are fried, most of my other parts also have warranty except for one or two of my SSDs, would I be able to claim warranty for these parts if it was caused by the PSU? I bought all the parts except for the GPU from the same retailer. (I'm in Australia which has good consumer protection laws but it would be helpful if someone can confirm if I have the right to claim warranty on the other parts in this scenario).
I did not want to open the power supply for various reasons but I did manage to take a few pictures of the inside. Hard to get a good look, let alone pictures without opening it up. Anyway here is what I think was the cause of the exploding capacitor.