most recent error/failure is
SMART failure predicted on hard disk 4: ST980811AS- (S3)
Warning: Immediately back-up your data and replace your hard disk drive. A failure may be imminent.
Press F1 to continue
I've tried pressing F1 I've tried hard shutting down the computer and starting it again and nothing can get past this screen - F1 does nothing, and restarting I can press F10 but not F11 or F12 to safe boot or anything like that - I've run diagnostics and they say replace hard drive but I've read conflicting reports on the SMART warning so I'm not sure if I really need to replace it - thoughts??? suggestions???