No, not anyone else's computer is hissing.
No, not anyone else's computer is hissing.
Probably the fans. Open your smart fan controller in BIOS and switch off all fans. If the noise disappears, it’s likely one of them. If not, go to MSI afterburner and disable your GPU fans to check if the issue resolves (most standard graphics card settings include a silent mode that stops fans at a specific temperature). When it cools, they may activate again every 10 seconds if the threshold is reached. Finally, verify if your PSU has an eco/silent mode. Some units also automatically adjust fan speed but still have moving parts causing the sound. In my experience, hard drives are often the culprit—especially with the characteristic click every 10 seconds when they fail. But SSDs don’t make that noise.
It could be fresh wine from aged parts, a damaged hard drive scratching its tracks, or a burst capacitor emitting fumes.