I have a Lenovo Ideapad Y480 laptop with Windows 8.1 installed. A few nights ago, my computer hung on the signout screen (it does this from time to time), and I had to turn it off by holding down the power button. Upon startup, it subsequently refused to load Windows, giving me a blue error screen with an 0xc0000001 error.
From what diagnostics Ive been able to run, it looks to me like this is an issue with a corrupted bootloader, and not a mechanical problem with the hard drive itself. Unfortunately, my efforts to repair this have so far failed.
Attempted Fixes: Things I have tried unsuccessfully include:
While my laptop didnt come with a recovery disc, Ive downloaded an ISO of the Windows 8.1 Enterprise trial from Microsofts website (
http://technet.microsoft.com/en-gb/evalcenter/hh699156.aspx) and used this to boot into the Windows 8.1 recovery environment. Through this disc, I attempted the following:
Startup repair: have tried multiple times, and get a startup repair failed message every time. Ive been able to load the error logs, which indicate Windows was unable to find the hard drive.
Windows refresh: Drive is locked error message
Windows reset: also produces a cannot reset message
Via the command prompt, also accessed via the repair disk, Ive attempted the following:
chkdsk on the main Windows partition returns no errors or bad clusters
bootrec: Attempted to use the instructions here:
http://pcsupport.about.com/od/fixtheproblem/ht/rebuild-bcd-store-windows.htm
Bootrec /fixmbr - cannot find the file specified
Bootrec /osloader - 0 windows installations found
Possibly notable: every time Ive accessed the command prompt since this error happened, Ive had to manually assign a drive letter to the main Windows OS partition. As is, it has none assigned when I enter the command prompt.
Additionally, Ive attempted to use my laptops built-in recovery functionality (Lenovo Onekey). Restoring the backup returns an error (cannot restore the system partition because its structure is incorrect).
Finally, I have been able to burn an Ubuntu Live disk (not actually installed, just bootable) to access basic PC functionality. It has also let me access the hard drive and backup my important files to an external drive. I have run its hard disk diagnostics, which do not indicate errors.
Recent Changes: None that I can think of.
Operating System: Windows 8.1 Home Premium (64-bit)
System Specs:
Lenovo IdeaPad Y480 (model 2093)
Intel Core i7-3630QM 2.4GHz Processor
8GB DDR3 1600 Memory
NVIDIA GeForce GT650M 2GB GDDR5