If you're hearing a clicking noise coming from your PC even when it's shut off, and you don't have any traditional hard disk drives (HDDs) with moving parts, it's unlikely to be related to storage activity.
Here are a few possibilities to consider:
1. **Cooling System**: The clicking noise could be coming from a cooling fan inside your PC. Fans are common components in computers, and they can sometimes make clicking noises if they're starting to wear out or if there's debris caught in them.
2. **Power Supply Unit (PSU)**: The clicking sound might be originating from the power supply unit. It's rare, but faulty capacitors or other internal components can sometimes cause clicking noises.
3. **Other Components**: Occasionally, other components like the graphics card or even the motherboard itself might make clicking noises due to electrical issues or component failure.
Since you're not very PC savvy, I'd recommend having a knowledgeable friend or a technician take a look at your PC. They can open it up and listen for the clicking noise to help identify its source. If it's a minor issue like a fan starting to fail, it's usually relatively straightforward to replace. However, it's essential to address any potential hardware issues early to prevent further damage to your PC.