PC basics glossary
The main parts inside a computer, explained for people who have never opened one. Each term is explained in plain English, in a sentence or two.
6 terms on this page
- Motherboard
The large board that everything else connects to: the processor, memory, graphics card, drives and power supply. If a part isn't properly connected to the motherboard, the PC can't use it.
Mentioned in: PC Turns On But No Display · PC Won't POST · Motherboard Debug Lights Meaning · New PC Build Won't Turn On
- CPU (processor)Also called: processor
The CPU, or processor, is the main chip that runs your programs. It sits in a square socket on the motherboard, hidden under a cooler with a fan or a metal heatsink.
Mentioned in: PC Turns On But No Display · PC Won't POST · Motherboard Debug Lights Meaning
- GPU (graphics card)Also called: graphics card
The graphics card (or GPU) creates the image sent to your monitor. In gaming PCs it's a separate card, usually the biggest part in the case, with its own fans and video ports.
Mentioned in: PC Turns On But No Display · PC Won't POST · Motherboard Debug Lights Meaning · Why Is My GPU Fan So Loud
- RAM (memory)Also called: memory, DRAM
RAM is the PC's short-term working memory. It comes as long thin "sticks" that clip into slots next to the processor. Without working RAM the PC can't start. "DRAM" means the same thing.
Mentioned in: PC Turns On But No Display · PC Won't POST · Motherboard Debug Lights Meaning · New PC Build Won't Turn On
- PSU (power supply)Also called: power supply
The power supply unit (PSU) is the metal box, usually at the bottom or back of the case, where the wall cable plugs in. It converts that power and sends it to the other parts through its own set of cables.
Mentioned in: PC Turns On But No Display · PC Won't POST · New PC Build Won't Turn On · Why Is My GPU Fan So Loud
- SSD / driveAlso called: hard drive, M.2
A drive stores Windows, your programs and files, and keeps them when the PC is off. Older hard drives (HDD) and SATA SSDs connect with cables; M.2 SSDs are small sticks that screw directly onto the motherboard.
Mentioned in: Motherboard Debug Lights Meaning
Other glossaries
Boot & BIOSGraphics cards & displayPower supplies & cablesRAM & storageCooling & noise