Dell OptiPlex 790 (Early 2011) - Manual (Page 88)

Time-of-day not set-please run the System Setup program
Description The time or date stored in System Setup does not match the computer
clock.
Timer chip counter 2 failed
Description A chip on the system board may be malfunctioning.
Unexpected interrupt in protected mode
Description The keyboard controller may be malfunctioning or a memory module may
be loose.
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.
Description During initial startup, the drive detected possible error conditions. When
your computer finishes booting, immediately back up your data and
replace your hard drive (for installation procedures, see "Adding and
Removing Parts" for your computer type). If no replacement drive is
immediately available and the drive is not the only bootable drive, enter
System Setup and change the appropriate drive setting to None. Then
remove the drive from the computer.
Write fault
Description The operating system cannot write to the floppy or hard drive.
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