IdeaPad U430 unmountable Boot Volume

My Laptop is not working.
When I turn it on, after Lenovo logo  I see a msg "Your PC ran in to a problem and need to restart...... search online for this error Unmountable Boot Volume."
Then automatically PC go to Auto Repair but after few seconds that msg dissapears.
I selected recovery option but after LEnovo logo nothing come on the screen.
I boot up with usb recovery media then also I can not see anything on the screen after logo.
What I can do

Hi Nalinpr,
Welcome to Lenovo Community!
 As per the query we understood that you are facing issue with unmountable boot volume in your Lenovo U430 laptop.
If your BIOS settings are configured to force the faster UDMA modes, this error may occur. In this situation, restart your computer and enter the BIOS and load the "fail-safe" default settings and reboot.
If neither of these issues are the cause for the Unmountable Boot Volume, then the issue most likely is caused by a damaged BOOT.INI file in the root directory of the boot drive or file system corruption.
Follow the steps below to correct these file system issues:
1) Start your computer with your windows 7 or any operating system which you have installed in the system CD-ROM, 
2) When the Welcome to Setup screen appears, press R to Repair the installation using the Recovery Console
3) If you have a dual-boot or multiple-boot computer, select the Windows installation you want to access
4) Type the administrator password when you are prompted, if no administrator password is set then just press Enter
5) At the command prompt, type CHKDSK /R and then press Enter
6) Once CHKDSK has finished checking and repairing the hard drive, type EXIT and press Enter to restart your computer
If this procedure does not work, repeat it and use the fixboot command in step 5 instead of the chkdsk /r command. FIXBOOT writes a new partition boot sector to the system partition. The fixboot command is only available when you are using the Recovery Console.
As you also mentioned that the system hangs at Lenovo logo please try to remove the hard drive if possible and try to boot to BIOs and check, also try to run the LSC diagnostics.
Hope this helps. Do post back if issue persists!
Best regards,       
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