Not always -- if you are comfortable opening your case and installing drivers and other software, the installation can be performed at home.
No, this item does not require professional installation.
You need to instal the same size and amp rating as you removed.You need to instal the same size and amp rating as you removed.
If your computer has a sound card there is no need to purchase a new one.
No. A sound card can be used without internet access, and the internet can be used without sound.
Yes.
You need to install driver for your sound card.
It could be any of these reasons:Your sound card is not working properlyYou have no sound cardYou need to install drivers for your sound card.You need new speakersYour connection jack on your sound card has been disconnected or damaged
You will need to go to the manufacturer's site to obtain the schematics for your particular unit. Changing a sound card may be something you need to have a professional do for you.
The sound card is the first item what you need to check. If have no problem with the card, you need to check the software. And maybe you need check the connection,
Skill
No, this sound card will be able to take over capabilities of the internal card.
You may need a new sound card if this keeps happening. If you have a warranty on your computer, you can contact the manufacturer to determine if they can replace the sound card.