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On a desktop it's easy to replace the sound card. Remove the power cord, open the case then purchase a PCI Sound card that will fit into one of the PCI Slots. You present sound card might be what is called an on board sound card (which is built into the motherboard). You won't touch the onboard sound card, you will simply add a pci sound card.
Yes, most likely you may need to replace the battery. Try to get a different cell capacity this time (I do not know if you currently have a 6 cell or 9 cell battery). Once it's not keeping a charge it most likely has a problem.
Hope this helps...
For that first open cpu cabinet then refix RAM memory try it in defferent slot on motherbord. Pull cmos cell from motherbord for 10 minutes so all settings goes to defaults. Then open processor fan and processor then refix both. Clean dust from all parts. Reconnect ATX power connector to motherbord. Reconnect power cable and sata or ide cable to harddisk. If any PCI cards are installed then remove it from pci clot then check. Make sure your motherbord is not ground with cabinet check in outside of cabinet . Let me know if you need further assistance.
Unfortunately, I have seen this many times. One of the major problems with the C400 model was the USB port failing. I have had many of them replaced under warranty, and I have repaired some. The USB port breaks loose from the mother board and stops working. It is possible to SOMETIMES disassemble the laptop enough to get to the port and re-solder the USB port connections. But is is a slow process for experienced people. And it does not work all of the time. i know that this is not the answer that you wanted.
Go into the battery properties and check if the battery is charging. If it says it is, then test it, use the battery to see if it really is charging, they will sometimes give a false reading. If it's not charging, then check the power supply with an ohm meter for the proper output. If this all checks good, but the battery isn't charging, then I'm afraid you have a failed power management system on the motherboard. The power management system controls the charging along with other power related aspects of the machine. If the power management system has failed, then unfortunately, you will have to replace the motherboard in order to fix it.