I have Abit IC7-G motherboard, and I want to connect Front Panel Audio connectors. I am able to connect speaker output correctly, but mic is not working. My mother board pins are layed as
1. Audio Mic. 2. Ground
3. Audio Mic. Bias 4. VCC
5. Spkr Out R 6. Spkr Out R retrun
7. X 8. NC
9. Spkr Out L 10. Spkr Out L retrun
11. Ground 12. S/PDIF in
13. VCC 14. S/PDIF out

My front panel has following pins:
Left 1, Left 2, Right 1, Right 2, Mic VCC, Ground, Mic in.

I connected
Mic in to 1. Audio Mic
Ground to 2. Ground
<nothing> to 3. Audio Mic. Bias
Mic VCC to 4. VCC
R 1 to 5. Spkr out R
R 2 to 6. Spkr out R return
L 1 to 9. Spkr out L
L 2 to 10. Spkr out L return
<nothing> to 11. Ground
<nothing> to 12. S/PDIF in
<nothing> to 13. VCC
<nothing> to 14. S/PDIF out

I suspect I need to connect something to 3. Audio Mic. Bias, but I have no such cable from front panel.
Any suggestions, what should I do?

Have you done this according to the motherboard manual?

Connecting the MIC-GND cable to GND on the mainboard will pull the outer contact of the microphone-connector to 0 Volt. When using a passive microphone (like a headset), pin 1 (MIC IN) will never see more than 0 Volt - you won't hear anything.
So the first test should be trying an active (battery-powered) microphone.
If this works, check if the GND-cables from the front-panel are separated for LINE-OUT and MIC IN. If so, you could connect the GND-cable from the MIC-IN connector to MIC-BIAS, which would provide power to the microphone. I've seen a PC-case with two GND-cables, but they were wired internally, so watch out for this (check with, ah, 'fluke' (ohm-meter,...), you know..., sorry for my english). If wired, check for a removable jumper/bridge in the case, or just take a knife to separate them.
WARNING: I have not tried this yet!
I'm not so familiar with BIAS-signals and what voltage a mic needs, so I don't know if the mic connected to the front panel would behave like rear-connected. You could build a kind of adapter (pin-to-MicConnector), set your software to 'record' and connect it for a few seconds to see if it works (don't touch anything else while it's powered on!).