Dell OptiPlex GX260 User Guide - Page 166

green yellow green yellow Possible video card failure or bad on-board video If you have a video card, reseat it and restart the computer to retest. If you have video integrated, you must replace the system board. yellow Possible floppy or hard green drive failure green yellow Reseat all power and data cables, and restart the computer to retest. green Possible USB failure green green yellow Reseat all USB devices and cables, and restart the computer to retest. yellow No memory detected yellow yellow green yellow Memory is detected, green but a memory yellow configuration or green compatibility error exists Reseat all memory modules and restart the computer. If the problem still exists, to eliminate the possibility of a faulty memory connector, install one memory module (if the computer supports a single module), and restart the computer. Then move the module to another connector and restart the computer. Be sure that the memory modules are compatible with your computer. If necessary, replace the memory modules. yellow Other failure green green green Check the computer message that appears on your monitor screen. green green green green Normal operating condition after POST None. Drive Problems Fill out the Diagnostics Checklist as you complete these checks. Floppy drive problems Test the drive Insert another disk to eliminate the possibility that the original floppy disk is defective. Insert a bootable floppy disk and reboot the computer. Ensure that the disk is not full or write-protected- Ensure that the disk has available space and that it is not write-protected (locked). See the following illustration.