{"title":"Boot \u0026 Startup","description":"\u003cp\u003eArticles covering firmware, boot-loader, and early-startup failures — the errors that appear before Windows ever reaches the login screen. This includes boot device detection, BCD and MBR\/GPT issues, disk read errors, and the specific 0xc0000… STOP codes shown during boot.\u003c\/p\u003e","products":[{"product_id":"windows-boot-error-the-system-registry-file-is-missing-or-corrupt","title":"Windows boot error: 'The system registry file is missing or corrupt'","description":"\u003cp\u003e\u003cstrong\u003eThe problem:\u003c\/strong\u003e Windows cannot boot because registry hives are corrupted or missing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSymptoms:\u003c\/strong\u003e Boot error indicating registry file missing\/corrupt (often SYSTEM hive); WinRE loop.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eLikely cause:\u003c\/strong\u003e Disk corruption, failed update, or abrupt shutdown leading to registry hive corruption.\u003c\/p\u003e\u003cp style=\"font-size:13px;color:#6b7280;\"\u003eCategory: Boot \u0026amp; Startup · Difficulty: Advanced · Windows: Both\u003c\/p\u003e\u003cp\u003eDigital knowledge-base article delivered as an instant download after purchase — no physical shipment.\u003c\/p\u003e","brand":"LVL1","offers":[{"title":"Default Title","offer_id":46984988197061,"sku":null,"price":13.99,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0809\/1831\/5205\/files\/lvl1-50.png?v=1790191034"},{"product_id":"boot-error-a-disk-read-error-occurred-mbr-boot-sector-issue","title":"Boot error: 'A disk read error occurred' (MBR\/boot sector issue)","description":"\u003cp\u003e\u003cstrong\u003eThe problem:\u003c\/strong\u003e System cannot read the boot sector\/MBR properly and fails to boot.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSymptoms:\u003c\/strong\u003e Message: \"A disk read error occurred. Press Ctrl+Alt+Del to restart.\"\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eLikely cause:\u003c\/strong\u003e Disk errors, corrupted boot sector\/MBR, or failing storage.\u003c\/p\u003e\u003cp style=\"font-size:13px;color:#6b7280;\"\u003eCategory: Boot \u0026amp; Startup · Difficulty: Advanced · Windows: Windows 10\u003c\/p\u003e\u003cp\u003eDigital knowledge-base article delivered as an instant download after purchase — no physical shipment.\u003c\/p\u003e","brand":"LVL1","offers":[{"title":"Default Title","offer_id":46984988459205,"sku":null,"price":1.99,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0809\/1831\/5205\/files\/lvl1-48.png?v=1790191028"},{"product_id":"windows-shows-reboot-and-select-proper-boot-device","title":"Windows shows 'Reboot and Select proper Boot device'","description":"\u003cp\u003e\u003cstrong\u003eThe problem:\u003c\/strong\u003e Firmware cannot find a valid boot device\/entry.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSymptoms:\u003c\/strong\u003e Message: \"Reboot and Select proper Boot device\" on startup.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eLikely cause:\u003c\/strong\u003e Boot order points to wrong device, OS disk not detected, or Windows Boot Manager entry missing.\u003c\/p\u003e\u003cp style=\"font-size:13px;color:#6b7280;\"\u003eCategory: Boot \u0026amp; Startup · Difficulty: Easy · Windows: Both\u003c\/p\u003e\u003cp\u003eDigital knowledge-base article delivered as an instant download after purchase — no physical shipment.\u003c\/p\u003e","brand":"LVL1","offers":[{"title":"Default Title","offer_id":46984988557509,"sku":null,"price":23.99,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0809\/1831\/5205\/files\/lvl1-47.png?v=1790191024"},{"product_id":"windows-boot-error-0xc0000185-i-o-device-error","title":"Windows boot error 0xc0000185 (I\/O device error)","description":"\u003cp\u003e\u003cstrong\u003eThe problem:\u003c\/strong\u003e Windows cannot boot due to an I\/O device error when accessing the boot volume.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSymptoms:\u003c\/strong\u003e Boot screen shows 0xc0000185; may mention I\/O error; boot loop.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eLikely cause:\u003c\/strong\u003e Failing disk, loose cable\/connection, controller issue, or corrupted boot files.\u003c\/p\u003e\u003cp style=\"font-size:13px;color:#6b7280;\"\u003eCategory: Boot \u0026amp; Startup · Difficulty: Moderate · Windows: Both · Error code: 0xc0000185\u003c\/p\u003e\u003cp\u003eDigital knowledge-base article delivered as an instant download after purchase — no physical shipment.\u003c\/p\u003e","brand":"LVL1","offers":[{"title":"Default Title","offer_id":46984988688581,"sku":null,"price":16.99,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0809\/1831\/5205\/files\/lvl1-46.png?v=1790190945"},{"product_id":"windows-boot-error-0xc000000e-required-device-isnt-connected-or-cant-be-accessed","title":"Windows boot error 0xc000000e (required device isn't connected or can't be accessed)","description":"\u003cp\u003e\u003cstrong\u003eThe problem:\u003c\/strong\u003e Windows cannot boot because it cannot access the required boot device.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSymptoms:\u003c\/strong\u003e Boot screen shows 0xc000000e; 'required device isn't connected or can't be accessed'; boot loop into recovery.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eLikely cause:\u003c\/strong\u003e Disk\/controller access issue, BCD pointing to wrong device, or EFI\/boot files corruption.\u003c\/p\u003e\u003cp style=\"font-size:13px;color:#6b7280;\"\u003eCategory: Boot \u0026amp; Startup · Difficulty: Advanced · Windows: Both · Error code: 0xc000000e\u003c\/p\u003e\u003cp\u003eDigital knowledge-base article delivered as an instant download after purchase — no physical shipment.\u003c\/p\u003e","brand":"LVL1","offers":[{"title":"Default Title","offer_id":46984989049029,"sku":null,"price":17.99,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0809\/1831\/5205\/files\/lvl1-43.png?v=1790190929"},{"product_id":"windows-boot-error-0xc0000001-recovery-pc-needs-to-be-repaired","title":"Windows boot error 0xc0000001 (Recovery: PC needs to be repaired)","description":"\u003cp\u003e\u003cstrong\u003eThe problem:\u003c\/strong\u003e Windows fails to start and shows recovery error 0xc0000001.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSymptoms:\u003c\/strong\u003e Recovery screen with 0xc0000001; boot loop into WinRE.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eLikely cause:\u003c\/strong\u003e Corrupted boot files\/BCD, disk issues, or failed update\/driver change.\u003c\/p\u003e\u003cp style=\"font-size:13px;color:#6b7280;\"\u003eCategory: Boot \u0026amp; Startup · Difficulty: Advanced · Windows: Both · Error code: 0xc0000001\u003c\/p\u003e\u003cp\u003eDigital knowledge-base article delivered as an instant download after purchase — no physical shipment.\u003c\/p\u003e","brand":"LVL1","offers":[{"title":"Default Title","offer_id":46984989311173,"sku":null,"price":17.99,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0809\/1831\/5205\/files\/lvl1-41.png?v=1790190922"},{"product_id":"windows-boot-error-0xc0000225-after-cloning-required-device-isnt-connected","title":"Windows boot error 0xc0000225 after cloning ('required device isn't connected')","description":"\u003cp\u003e\u003cstrong\u003eThe problem:\u003c\/strong\u003e After disk clone\/migration, Windows fails with 0xc0000225 because boot references don't match new disk.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSymptoms:\u003c\/strong\u003e 0xc0000225 after migration; winload.efi referenced; boot loop.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eLikely cause:\u003c\/strong\u003e BCD entries still reference old disk identifiers or EFI partition not correctly migrated.\u003c\/p\u003e\u003cp style=\"font-size:13px;color:#6b7280;\"\u003eCategory: Boot \u0026amp; Startup · Difficulty: Advanced · Windows: Both · Error code: 0xc0000225\u003c\/p\u003e\u003cp\u003eDigital knowledge-base article delivered as an instant download after purchase — no physical shipment.\u003c\/p\u003e","brand":"LVL1","offers":[{"title":"Default Title","offer_id":46984989442245,"sku":null,"price":17.99,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0809\/1831\/5205\/files\/lvl1-40.png?v=1790190920"},{"product_id":"windows-boot-error-inaccessible_boot_device-after-enabling-intel-vmd-rst","title":"Windows boot error: 'INACCESSIBLE_BOOT_DEVICE' after enabling Intel VMD\/RST","description":"\u003cp\u003e\u003cstrong\u003eThe problem:\u003c\/strong\u003e Windows fails to boot after storage controller configuration change to Intel VMD\/RST.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSymptoms:\u003c\/strong\u003e BSOD INACCESSIBLE_BOOT_DEVICE shortly after boot; boot loop.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eLikely cause:\u003c\/strong\u003e Storage mode changed without driver support in the installed OS (VMD\/RST requires appropriate driver).\u003c\/p\u003e\u003cp style=\"font-size:13px;color:#6b7280;\"\u003eCategory: Boot \u0026amp; Startup · Difficulty: Advanced · Windows: Both\u003c\/p\u003e\u003cp\u003eDigital knowledge-base article delivered as an instant download after purchase — no physical shipment.\u003c\/p\u003e","brand":"LVL1","offers":[{"title":"Default Title","offer_id":46984989606085,"sku":null,"price":17.99,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0809\/1831\/5205\/files\/lvl1-38.png?v=1790190910"},{"product_id":"boot-error-an-operating-system-wasnt-found-after-changing-bios-boot-mode","title":"Boot error: 'An operating system wasn't found' after changing BIOS boot mode","description":"\u003cp\u003e\u003cstrong\u003eThe problem:\u003c\/strong\u003e After switching between UEFI and Legacy\/CSM, firmware no longer finds the installed OS.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSymptoms:\u003c\/strong\u003e Boot message: OS not found\/no bootable device after BIOS change; disk still detected.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eLikely cause:\u003c\/strong\u003e OS installed in UEFI\/GPT but firmware set to Legacy, or OS installed in Legacy\/MBR but firmware set to UEFI-only.\u003c\/p\u003e\u003cp style=\"font-size:13px;color:#6b7280;\"\u003eCategory: Boot \u0026amp; Startup · Difficulty: Moderate · Windows: Both\u003c\/p\u003e\u003cp\u003eDigital knowledge-base article delivered as an instant download after purchase — no physical shipment.\u003c\/p\u003e","brand":"LVL1","offers":[{"title":"Default Title","offer_id":46984989737157,"sku":null,"price":23.99,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0809\/1831\/5205\/files\/lvl1-37.png?v=1790190908"},{"product_id":"windows-displays-inaccessible_boot_device-bsod-during-startup","title":"Windows displays INACCESSIBLE_BOOT_DEVICE BSOD during startup","description":"\u003cp\u003e\u003cstrong\u003eThe problem:\u003c\/strong\u003e Computer crashes with 'INACCESSIBLE_BOOT_DEVICE' blue screen error during boot.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSymptoms:\u003c\/strong\u003e Blue screen appears during boot with INACCESSIBLE_BOOT_DEVICE error; system crashes repeatedly on startup; cannot boot Windows.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eLikely cause:\u003c\/strong\u003e Storage driver missing or corrupted; Boot Configuration Data (BCD) corrupted; SSD\/HDD driver incompatibility; disk connection loose; Windows installed on inaccessible partition.\u003c\/p\u003e\u003cp style=\"font-size:13px;color:#6b7280;\"\u003eCategory: Boot \u0026amp; Startup · Difficulty: Advanced · Windows: Both · Error code: INACCESSIBLE_BOOT_DEVICE\u003c\/p\u003e\u003cp\u003eDigital knowledge-base article delivered as an instant download after purchase — no physical shipment.\u003c\/p\u003e","brand":"LVL1","offers":[{"title":"Default Title","offer_id":46984989868229,"sku":null,"price":9.99,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0809\/1831\/5205\/files\/lvl1-36.png?v=1790190905"}],"url":"https:\/\/www.lvl1.store\/collections\/boot-startup.oembed","provider":"LVL1","version":"1.0","type":"link"}