What would have happened if computers didn't have magnets?

If magnets and electromagnets were never invented, it is likely computers would not exist. The first computers required the magnetic properties of relays and/or vacuum tubes to function.

Even modern computers rely on magnetics to spin fans, spin hard drives, CD/DVD drives, produce sound, provide power through the power supply, increase voltage through induction, rectify power flow, and read/write data to hard drives, floppy drives, and other magnetic media.