I got in from work and my laptop had an error on it. On restarting the laptop a black screen came up with the error message "SMART Hard disk error. The SMART hard disk check has detected an imminent failure." It recommended running the Hard Disk test in System Diagnostics. The memory check and quick hard disk check passed. I then pressed enter and tried to startup the laptop but the error message "Boot device not found. Pleae install an operating system on your hard disk" came up. I've looked through all the HP Support Assistant pages online and tried to restore the BIOS default settings by pressing F10 and F9 and saving the changes, but this didn't seem to help. I also tried an extensive hard disk check but after 1 minute it says that it has passed. Please help! I'm not sure sure what else I can try.