Dell OptiPlex 755 - Manual (Page 50)

50
Quick Reference Guide
Side View
8 hard drive access
light The hard drive access light is on when the computer reads
data from or writes data to the hard drive. The light might
also be on when devices such as your CD player are
operating.
9 vents The vents help prevent your computer from overheating. To
ensure proper ventilation, do not block these cooling vents.
1 vents The vents located on each side of the computer help prevent your
computer from overheating. To ensure proper ventilation, do not
block these cooling vents.
2 mounting
holes For mounting optional stand.
1 2