Nowadays with SSDs you no longer hear if a PC is working, especially if its fans are quiet. Products like the DreamCheeky USB gadgets (looks like they went out

Nowadays with SSDs you no longer hear if a PC is working, especially if its fans are quiet. Products like the DreamCheeky USB gadgets (looks like they went out of business in 2017 https://web.archive.org/web/20170821050810/http://www.dreamcheeky.com:80/ https://web.archive.org/web/20170821050810/http://www.dreamc... ) or the more recent Diwoom Pixel Art gadgets could be used to signal activity. There are probably a lot more solutions to this problem if you have a server sitting on or below your desk ;-)