We will get this sound working !
OK, So you are trying to use the 'on-board' (integtrated) audio?
The best guide I can think of, is do you get the Windows 'Tune' when the desktop appears ? I would guess you don't.
I will do a list of what you need to get on-board sound working.....
1) In BIOS screen, find 'onboard devices', then 'integrated audio'
move up or down with arrows, Enter to modify, choose, 'enable'.
2) Download and install audio codec,
just google 'AC97 audio codec'
'Softwarepatch' has it.
3) Make sure your PC speakers are working, (plug into MP3 player or radio earphone socket to see if they amplify), then plug into Green and Blue sockets, on back of PC.
4) Go to 'Control panel', 'Hardware & sound', 'Manage audio devices',
then right-click on the speakers icon, choose 'enable'.
You should have sound if you have done all that.
BUT, I would guess you are not getting into the BIOS settings.
When you switch on PC, you will see in white text on black background the words
'SETUP F2'
But its possible your PC uses 'Esc' key. Press 'Esc' as soon as the PC screen shows any colour or text, for instance mine shows 'DELL', I press F2 right there.
You try 'Esc' key (top left of your keyboard).
You will see a blue or black background, with white text. Look around the screen for the instructions. This is the BIOS. You may have a list down the left, or tabs along the top. Move around to 'on board devices' heading. YOU CAN ONLY USE ARROW KEYS, ENTER AND ESC. Press 'enter' on that. Move down to 'integrated audio' . Press 'enter' on that. You can then see 'ON' ,'OFF'
Use the Left and Right Arrows to select 'ON', press enter.
Last Press 'F11' or choose 'Save and exit'.
Your PC will reboot and sound should work.
If this still fails, I will send some photos of my screens to help.
Is your PC new from a shop, or did you build it? Is it a brand I might know?
Did the sound ever work?
Good luck, keep trying.