Gather components: case, motherboard, CPU, CPU cooler, RAM, storage, power supply, GPU, cables, thermal paste if needed
Prepare a clean, static-free workspace
Open the case
Install the power supply
Install the CPU on the motherboard
Apply thermal paste if required
Install the CPU cooler
Install the RAM
Install the storage drive
Mount the motherboard in the case
Connect the main power cables to the motherboard
Connect CPU power cable
Install the graphics card
Connect storage and case cables
Connect front panel connectors
Connect case fans
Check all connections
Close the case
Connect monitor, keyboard, and mouse
Power on the computer
Enter BIOS/UEFI
Verify hardware detection
Install the operating system
Install drivers and updates