12-07-2016 02:14 PM
My computer type is thinkpad x240
NOw, my computer existed the error 0xc000021a, and i cannot go any mode such as recover mode, safe mode. I don't know what should i do. Please, anyone helps me or gives suggestions for this situation.
12-07-2016 02:27 PM
What operating system? First thing, I would run built-in diagnostics. (hit F10 at start-up)
12-07-2016 02:44 PM - edited 12-07-2016 02:50 PM
What version of Windows do you have?
Have you already created a recovery drive for your OS, or do you have another computer that you can use to create a recovery drive/USB key if needed?
Do you have a 4GB or larger USB thumb drive/memory stick, or external USB CD/DVD etc?
You can download from Microsoft the installation media for Windows 8.1 or 10 for free from the link below, and then use it to boot into recovery mode and fix your computer. So step one would be get a bootable USB drive or DVD to use to repair your computer.
If you have a friend with the same 32 or 64 bit version of Windows 8.1 or 10 (most likely you had a 64-bit version), you can create recovery media from their PC to fix yours too, but if in doubt, just create a Windows install medial USB key or DVD using the link below.
(Note: The PC you use to create a recovery drive from need not be of the same Home or Pro version as your own, but it must be of the same OS (8.1 or 10) and 32/64 bit type as yours to work).
Create installation media for Windows
12-07-2016 05:55 PM
Buried in this is a workaround:
finally i tried to boot with "force drivers to have signature disabled" and it worked.
12-07-2016 06:10 PM - edited 12-07-2016 06:37 PM
Glad to see that worked for you, but unless you recently added a questionable device driver, you should open a command prompt (admin) and run sfc /scannow to repair your system files since they are probably corrupted if they failed signature verification, as it could be caused by malware. It could be a poorly written or malicious device driver that was recently installed too, so running a full virus scan using a reputable antivirus program should also be on your list too.
Your next step should be to create recovery media on a DVD or USB stick so you will have it on hand should you ever need it.
Create a Recovery Drive or System Repair Disc in Windows 8, 8.1 and 10