Step 1: Shut down your Laptop.
Step 2: Find the small NOVO button on Left side of your Laptop near the Power cord Point. Press the button. The System loads Boot Options..
Step 3: Click on the BIOs Setup Option. A Blue screen menu appears use arrow keys to navigate to Exit option and select
OS optimized Defaults to Win 7 ( The Default is Windows 8 64 Bit)
Step 4: If you are about to Install a Fresh Copy of Windows 7 Then Goto Configuration Tab and Change
USB Mode to USB 2.0 (Original may be USB 3.0)
In case you are already Running Windows 7 and the Problem was caused by Updating Your BIOS then
Then rest the Bios by using the option given in the Status Bar.
Step 5: Goto Exit and Select Exit Saving Changes. Select Yes
Sursa https://forums.lenov...30/td-p/1654059