Home Forums Tech Helproom Secure Boot Violation. Invalid Secure Boot Policy Forum Rules | Contact Forum Editor | Report a Post Secure Boot Violation. Invalid Secure Boot Policy compumac 09:32 29 Jul 2018 Locked My daughter has a Samsung NP355U5c laptop upgraded from Windows 8 to Windows 10. The unit has been working perfectly well until yesterday when upon switching on displayed the following “Secure Boot Violation.” “Invalid signature detected. Check Secure Boot Policy in Setup.” In Setup Secure Boot Policy displays enabled. Searching the internet suggested disabling Secure Bot Policy, which we did but it made no difference Any help appreciated. Fruit Bat /\0/\ 09:58 29 Jul 2018 when you disabled it did you save and exit (using f10)? Fruit Bat /\0/\ 09:58 29 Jul 2018 also disable fast boot and retry. compumac 10:33 29 Jul 2018 Fruit Bat /\0/\ Yes exited using f10 to save. Had not tried Advanced/Fast Bios Mode. Now tried disabling fast BIOS Mode but still just the same. Finishes with Samsung Logo and then zilch Fruit Bat /\0/\ 16:01 29 Jul 2018 Download and make the windows 10 boot media so that you can repair windows. if the machine will not boot from USB then: look for CSM setting to enable it and then you can boot from a bootable USB a to repair windows start ssystem compumac 19:01 29 Jul 2018 Was able to boot up from Win 10 DVD and tried repair. "Local disc has errors" Scanned and tried to repair errors, but could not repair. Was able to access System Restore but after an hour received message could not be restored. I think a visit to loacl computer shop might be the answer unless there are further suggestions. compumac 08:32 30 Jul 2018 The laptop had initially Win 8 installed and then updated free to Win 10. Also Microsoft Office was purchased and installed in 2013. There is a receipt to hand from Microsoft Office but that is all. There are no discs with the laptop and there has been no images made. If a new drive in the form of an SSD was to be purchased what are the implications of being able to install Win 10 and Microsoft Office? Fruit Bat /\0/\ 18:51 30 Jul 2018 Chkdsk /r c: compumac 11:18 01 Aug 2018 Update HDD was duff Now replaced with SSD Thanks for all input This thread is now locked and can not be replied to.