some bad day, My HP pavilion stuck on the booting screen, here is what it looks like,
Info: An unexpected I/0 error has occurred.
So basically, it’s an IO error, for sure, should be disk IO error. then I go to the bios, Diagnostics-> hard drive test,
Get an 303 error, looks like 404 for geeks,
here is the HP error codes, http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01443317
No magic, the hard drive died, replace a new one will fix the issue.