Hi Peroxide, and welcome to TSG.
Have you tested your microphone by plugging it into the microphone jack on the motherboard, sound card microphone input, and on the case microphone input?
Have you tested your microphone on another computer or other device with a known functioning microphone input?
Did you install any needed drivers for your sound card without any errors?
Does the Windows audio control panel show that the microphone is not muted or have it's volume turned down?
Does the Windows Hardware Manager show any errors or warnings for the on board sound and/or sound card?
What are the brands and model numbers of your microphone and sound card?
Have you tested your microphone by plugging it into the microphone jack on the motherboard, sound card microphone input, and on the case microphone input?
Have you tested your microphone on another computer or other device with a known functioning microphone input?
Did you install any needed drivers for your sound card without any errors?
Does the Windows audio control panel show that the microphone is not muted or have it's volume turned down?
Does the Windows Hardware Manager show any errors or warnings for the on board sound and/or sound card?
What are the brands and model numbers of your microphone and sound card?