A global IT outage grounded flights and resulted in outages at the London Stock Exchange and other systems early Friday morning.

Industries ranging from healthcare to banking, air travel, and others are struggling with a global IT outage that hit Microsoft Windows PCs and servers connected to the CrowdStrike security platform early Friday morning. It could take a while to fully resolve these Blue Screen of Death (BSOD) errors, with the standard fix requiring a trip into Safe Mode, but Microsoft is now advising that rebooting systems affected by the CrowdStrike glitch up to 15 times could get them back up and running.

CrowdStrike, which is a cybersecurity firm based in the US, said on Friday that a faulty update was the culprit, not a “security incident or cyberattack,” according to a post on X by CEO George Kurtz. Banks, airlines, TV broadcasters, supermarkets, and even Starbucks had systems crashed due to the problem.

Thousands of flights have been delayed or canceled, and some businesses are now slowly beginning to come back online. Kurtz told NBC News that it “could be some time” before systems recover.