![\"Windows](\"https:\/\/www.newsbeep.com\/ca\/wp-content\/uploads\/2026\/01\/1769375049_778_0x0.jpg\")
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PCs are now failing to start.<\/p>\n
NurPhoto via Getty Images<\/p>\n
Just when you thought it was safe to update your PC and get back to work, there\u2019s another warning about January\u2019s mandatory security update. You\u2019ll know if you\u2019re affected, because your PC will show you nothing but the Black Screen of Death.<\/p>\n
\u201cAccording to Microsoft,\u201d Windows Latest<\/a> reports, \u201caffected PCs could suddenly stop booting and land on the Black Screen of Death (BSOD) error with stop code UNMOUNTABLE_BOOT_VOLUME.\u201d<\/p>\n ForbesMicrosoft Confirms Emergency Update For Millions Of Outlook UsersBy Zak Doffman<\/a><\/p>\n Microsoft says<\/a> it has \u201creceived a limited number of reports of an issue in which devices are failing to boot.\u201d It has asked affected users and admins to report issued. In reality, it\u2019s too soon to know how widely this impacts. All update issues start as \u201climited\u201d numbers, but then it becomes clear with some that it\u2019s much more widespread.<\/p>\n Thus far we know it affects both Windows 11 25H2 and Windows 11 24H2 with KB5074109 installed. This mandatory update \u201cpatches as many as a hundred known security issues, which is why it\u2019s installed automatically on PCs.\u201d<\/p>\n Fail to reboot issue<\/p>\n Windows Latest<\/p>\n This comes just hours after reports that another emergency update<\/a> has been issued by Microsoft to affect other problems besetting users, specifically Outlook<\/a> becoming \u201cunusable<\/a>.\u201d And it comes a week after the first emergency update for January fixed failed shutdowns and remote logins. All told, a difficult few weeks for Microsoft.<\/p>\n That 0xED error code \u201cis typically related to system corruption, a damaged BIOS\/boot, or hardware failure, specifically the drive.\u201d Affected devices “show a black screen with the message \u2018Your device ran into a problem and needs a restart. You can restart.\u2019 At this stage, the device cannot complete startup and requires manual recovery steps.\u201d<\/p>\n