BennyBoop

My dad's Windows 10 PC was working fine yesterday, but this is what happens now: Upon startup: 1. Seems to start normally (spinning dots w/ Lenovo logo) 2. Spinning dots come back w/o logo and freeze for a few seconds 3. Blue screen (NOT BSOD) states that Windows didn't load correctly. It gives the option to restart or go into the Recovery Environment. 4. Trying a restart results in 1 and 2 above, then BSOD occurs, with error code 0xc000021a 5. Restarting again makes 1-3 above happen again Here are all of the things I tried to fix this: 1. Refreshing - FAILED 2. Rerunning Startup Repair - FAILED 3. Going back to previous build - FAILED 4. CMD Command Prompt - Attempted to fix MBR (Master Boot Record) with command bootrec.exe /fixmbr The operation completed successfully. - Attempted to fix boot with command bootrec.exe /fixboot The operation completed successfully. All of which yielded no change whatsoever. 5. System Image Recovery - This was my dad's PC; he never created a system image anywhere, so that's out. 6. Tried BIOS & Hardware Fixes - Boot was set to the correct drive, it hands the hardware then to Windows Boot Manager, as it normally should. - Removed graphics card, set to integrated graphics instead to determine if an NVIDIA driver was the culprit. - Changed from Legacy to UEFI mode first (I was sure this wasn't going to make a difference, but I wanted to be thorough) - Excluded all but the boot drive from boot order. - Removed CMOS battery and replaced a few minutes later. This yielded no change. 7. Removed boot drive and connected to my PC. I searched in the log files (Windows>System32>LogFiles>Srt). SrtTrail.txt shows the error. This shows the Startup Repair diagnosis and repair log. Startup Repair did the following. - Check for updates: 0x0 (No Error) - System disk test: 0x0 (No Error) - Disk failure diagnosis: 0x0 (No Error) - Disk metadata test: 0x0 (No Error) - Target OS test: 0x0 (No Error) - Volume content check: 0x0 (No Error) - Boot manager diagnosis: 0x0 (No Error) - System boot log diagnosis: 0x0 (No Error) - Event log diagnosis: 0x0 (No Error) - Internal state check: 0x0 (No Error) No errors were found, so it then states the following: Root cause found: --------------------------- Startup Repair has tried several times but still cannot determine the cause of the problem. In addition, bootfailure.txt shows nothing. Also, disklayout.txt shows the partitions are all fine. I really don't want to have to perform a full reset. Many single-licence programs are on the drive, and I don't know if they can be reinstalled. I heard that third-party apps can cause such issues, but the only thing installed since was Assassin's Creed (PC game), which should be fine, and a CrystalDiskMark test was run. These were both done on my PC as well, and there isn't any issue. There wasn't any Windows update or anything either. Any help would be greatly appreciated. I asked the same question in Microsoft Community under the same title.