Hi, first time posting here and not a native speaker, I hope I'm doing everything right. This is my problem:
Three days ago when I turned on my computer that I built almost 4 years ago (never had any problems) it shut off and it smelled like burnt plastic. I disassembled everything and found the source of the smell to come from the power supply (Corsair RM550) so I ordered a new one (Seasonic M12II-520 Evo).
It arrived yesterday so I connected back all the cables to the new power supply, tried to turn it back on but it still wasn't working, the fans spun for maybe a second and then it would shut off. I tried disconnecting all the unnecessary parts such as the graphics card and left the bare minumum but nothing changed.
Fast forward to today: I double checked all the cables and connections and tried once again turning it on. I see smoke coming from the disks so I immediately turn off the power supply and disconnect the cables. From the image below you can see that the SSD power connector (the one on top) is a bit molten while the HDD (the one on the bottom) was mostly ok, just a little molten plastic that I removed. The other HDD I had in my system doesn't look damaged.
So my questions are:
What is causing the issue? My first idea was the power cable connecting the disks to the power supply since I didn't replace it with the new ones that came with the new power supply.
Can I recover the data from the disks? There isn't anything really important in them but the SSD was my primary driver with the OS and some files I'd like to recover if possible (music library, photos, save files).
If it's useful to know I live in Italy. If you need any more informations/photos feel free to ask. Any help is greatly appreciated!