I have two lenovo thinkcentre a55, bought in jan

This is a motherboard originally for an IBM Lenovo ThinkCentre A55
I found a manual on:
http://download.lenovo.com/ibmdl/pub/pc/pccbbs/thinkcentre_pdf/41x5664.pdf
page 43 gives a lay-out overview which connectors need to be attached to the front panel: 12 and 17.
12 are 2 USB 4-pin connectors and 17 is on the picture I found a black plastic block with a special connector next to the CMOS battery.
http://cdn3.volusion.com/wafsx.utqdd/v/vspfiles/photos/42Y6492-2.jpg?1387802031
You might consider connecting simple pins from connector 14, if that is easier for your casing.

http://www.manualsdrive.com/results.php?lang=en&search=APCB%20M3%2094V-0&#.UsjzNbSmodU


FIND THIS.

What is the make and model number of your unit?

Buy a new case. Even though you can get quite a number of motherboards to fit. You will never get the front panel connections on the new motherboard to match up with the custom front panel wires on the Lenovo case.

??? ?????? 00ce ?????? ? ???????? ????? ??????????????,Lenovo ThinkCentre 92m 03T6821 Intel Socket LGA1155

Right click on 'my computer' > manage > device manager > at the right side of the list search for 'Sound, Video and game controls, right click above it, and select properties and click 'Roll back' ( also update the audio driver)

IBM LENOVO THINKCENTRE M55e A55 MOTHERBOARD FRU = 45C3282

try this link, see if you can find the sound driver for Windows 7 , IBM site

http://www-307.ibm.com/pc/support/site.wss/MIGR-66440.html

ThinkCentre A55 8985-B63 Driver Download

*Brand: Desktop
*Family: ThinkCentre A55
*Type: 8985
*Model: B63
*Operating System: Your Operating System
*Click on Continue
*Refine Results: Audio
*Download and Install

Thanks for using Fixya

If u could not hear the audio means check wheather the audio drivers have been installed properly.....if not get the drivers from the site WWW.SOFTPEDIA.COM
Reply if satisfies