Question

why can't a computer work without a RAM or ROM​

Answer 1

Explanation:

It is not possible to run a PC without RAM for any modern PCs. It is possible to run on very little RAM and extend with a disk, but you need some RAM because the BIOS gets loaded into RAM when you push the power button. Unless you modify the hardware, you will not be able to start the computer.

Answer 2

Explanation:

In theory a PC can run without a RAM. The RAM comes from the Random Access Memory. In fact our PCs start and work without RAM until the PC will need to load the operating system.