Dell OptiPlex GX270 - Manual (Page 127)

Cable Colors
System Board Components
1 hard drive 6 heat sink and blower assembly
2 internal speaker 7 power supply
3 chassis intrusion switch 8 floppy drive
4 system board 9 CD/DVD drive
5 padlock ring
Device Color
Hard drive Blue pull tab
Floppy drive Black pull tab
CD/DVD drive Orange pull tab
Serial ATA drive Blue cable