Video testing

cd␣/usr/x11/libexec/xscreensaver↵

or, doing it one step at a time helps locate typing mistakes:
cd␣/usr↵
cd␣x11↵
cd␣libexec↵
cd␣xscreensaver↵

./gflux␣-fps↵

write down the FPS on the "tested" label

grep␣-i␣kb␣/var/log/Xorg.0.log↵

write down the memory on the "tested" label
16,384kb = 16mb
8,192kb = 8mb
1,024kb = 1mb

Sound testing

aplay␣-l

This lists the soundcards that are detected. Make sure there's at least one soundcard listed.

cd␣/opt/kde/share/sounds↵

or, doing it one step at a time helps locate typing mistakes:
cd␣/opt↵
cd␣kde↵
cd␣share↵
cd␣sounds↵

while␣true;␣do␣aplay␣k3b_success1.wav;␣done↵

plug in the headphones, and make sure you can hear the audio playing

Glossary

␣ press spacebar

↵ press enter