Recently, I decided to rebuild a ten year old computer to use as a Linux server. After running it as a Minecraft server for five months, I got a new machine and took the HDD, power supply, and Optical drive from it. Well, now I've gathered enough replacement parts to get it working again. After powering it on, I got an intense smell of ozone.
I'm worried about testing it further because my wife is pregnant and I don't want her inhaling the fumes.
The only parts that I've installed since it was working are the PSU, HDD, and Optical drive. Which one of these is most likely the culprit and why?