Dell PowerEdge 1750 - Manual (Page 9)

If the optional RAID on motherboard (ROMB) card is activated, two indicators on each of the hard-drive carriers provide information on the status of the SCSI
hard drives. See Figure 1 -3 and Table 1 -3 . The SCSI backplane firmware controls the drive power -on/fault indicator.
Figure 1-3. SCSI Hard-Drive Indicators
Table 1 -3 lists the drive indicator patterns. Different patterns are displayed as drive events occur in the system. For example, if a hard-drive fails, the "drive
failed" pattern appears. After the drive is selected for removal, the "drive being prepared for removal" pattern appears, followed by the "drive ready for
insertion or removal" pattern. After the replacement drive is installed, the "drive being prepared for operation" pattern appears, followed by the "drive online"
pattern.
Table 1-3. Hard-Drive Indicator Patterns
Back-Panel Features and Indicators
Figure 1 -4 shows the controls, indicators, and connectors located on the system's back panel.
Figure 1-4. Back-Panel Features and Indicators
NOTE: If the optional ROMB card is not installed, only the "drive online" indicator pattern appears. The drive-activity indicator also blinks when the drive
is being accessed.
Condition Indicator Pattern
Identify drive The green power-on/fault indicator blinks four times per second.
Drive being prepared for removal The green power-on/fault indicator blinks two times per second.
Drive ready for insertion or removal Both drive indicators are off.
Drive being prepared for operation The green power-on/fault indicator is on.
Drive predicted failure The power-on/fault indicator slowly blinks green, amber, and off.
Drive failed The amber power-on/fault indicator blinks four times per second.
Drive rebuilding The green power-on/fault indicator blinks slowly.
Drive online The green power-on/fault indicator is on.
NOTE: Connect the power cable to connector PS1 if your system only has one power supply. See Figure 1-4.