Dell OptiPlex 990 (Early 2011) - Manual (Page 7)

Shutdown failure ......................................................................................................89
Time-of-day clock stopped ......................................................................................89
Time-of-day not set-please run the System Setup program ...................................90
Timer chip counter 2 failed ......................................................................................90
Unexpected interrupt in protected mode .................................................................90
WARNING: Dell's Disk Monitoring System has detected that drive [0/1] on the
[primary/secondary] EIDE controller is operating outside of normal
specifications. It is advisable to immediately back up your data and replace
your hard drive by calling your support desk or Dell.
...............................................90
Write fault .................................................................................................................90
Write fault on selected drive ....................................................................................91
X:\ is not accessible. The device is not ready ..........................................................91
21 Specifications.........................................................................................93
Technical Specifications .................................................................................................93
22 Contacting Dell.....................................................................................103
Contacting Dell ..............................................................................................................103