As Super Users in the computer land, many of us has heard about lots of myths about computer systems.
What are your most heard common myths about PC?
- For readability reason, please limit each entry to one answer only.
- Hardware and software myths are welcome!
- Not limited to Windows but Mac/Linux are welcome too...
Please do not debate/rebut people's answers, but I think intelligent discussions will lead to more meaningful Q&A in superuser.com. I'll start with this hardware myth:
You should always power on your PC because powering on/off your PC is a bad thing. Heating up and cooling down the IC expands and contracts the molecules, which will damage the silicon die and its connections traces.

) articles and compare with the others