Solving Problems: Dell OptiPlex GX260 Systems User's Guide4-2-2 Shutdown failure Contact Dell for technicalassistance.4-2-3 Gate A20 failure Contact Dell for technicalassistance.4-2-4 Unexpected interrupt in protected mode Contact Dell for technicalassistance.4-3-1 Memory failure above address 0FFFFh Run the Dell Diagnostics.4-3-3 Timer-chip counter 2 failure Contact Dell for technicalassistance.4-3-4 Time-of-day clock stopped Contact Dell for technicalassistance.4-4-1 Serial or parallel port test failure Run the Dell Diagnostics.4-4-4 Cache test failure Run the Dell Diagnostics.Card ProblemsFill out the Diagnostics Checklist as you complete these checks.CAUTION: Before you perform this procedure, see "CAUTION: Safety Instructions."Check the card seating and cables1. Turn off the computer and devices, disconnect them from their electrical outlets,wait 10 to 20 seconds, and open the computer cover.2. Ensure that each card is firmly seated in its connector. Reseat any loose cards.3. Ensure that all cables are firmly connected to their corresponding connectors on thecards. If any cables appear loose, reconnect them.For instructions on which cables should be attached to specific connectors on a card,see the card's documentation.4. Close the computer cover, reconnect the computer and devices to electrical outlets,and turn them on.http://support.dell.com/support/edocs/systems/opgx260/en/ug/solvprob.htm (3 of 30) [10/25/2007 1:44:24 PM]