.

Also asked, what happens if you don't have a graphics card?

Even today, if you buy a computer without a graphics card—hardware that includes a GPU, storage space dedicated to graphics, and on-board cooling—you'll still be able to see movement on screen. Still, you'll still get the best graphics performance from a separate (also called a "discrete") graphics chip.

Beside above, do you need a video card for remote desktop? eibgrad : You don't necessary need a video "card", but you do need a working video "chipset", which is what produces the video signal. Whether that chipset is made available via an add-on video card or integrated/on-board graphics doesn't matter.

Considering this, do all computers have graphics cards?

As stated earlier, all computers have a GPU. However, not all computers have a dedicated GPU. A dedicated GPU is a second GPU that's installed on the motherboard. If you're talking about a PC, the integrated GPU will likely be an Intel chip while the dedicated GPU will either be an Nvidia or AMD chip.

Can a PC run without RAM?

Simply put, no. 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.