Backup your data and do a factory restore.
I don't know what the key is on a Lenovo. But you should be able to restore the Laptop back to how it was when you first got it.
Check the instructions that came with your Laptop.
Then after that I would do a full backup and/or create a restore point.
It sounds software related as apposed to hardware.
You could also go to the audio devices manufacturers website to see what other drivers are on there. It could be possible that you might have more joy with another version.
I've recently had all kinds of problems with a M-Audio Sound Card on my PC. Users have reported that they can get their card working on Windows 8 using the Win7 x64 driver. I tried everything but I couldn't get it to work.
Luckily for me it's not my main Audio Device. But I know what you are going through.