virus - Infected Computer Behavior Signs

I'm wondering if anything atypical of your computer can be a headsup for a virus/malware infection?

If all of a sudden my sound panel is acting funny, can it be a sign of a virus? If I suddenly can't seem to highlight things with my cursor, could it be a virus?

What are some common and uncommon behaviors for infected computers?

Pornographic popups are usually a red flag.

Answer

I have never seen anything go wrong with sound panels that would tell me a virus was to blame - although if you say the actual symptoms, it may help.

Typically with me it is-

1. Random high CPU utilisation


2. Random events


3. Random popups


4. Hearing a lot of noise from hard drive when computer should be idle.


5. Anything else random or the opposite to what I am expecting in a certain situation.