Dell OptiPlex 755 User's Guide - Page 352

Message CH-2 Timer Error CMOS Battery State Low CMOS Checksum Failure CMOS System Options Not Set CMOS Display Type Mismatch CMOS Memory Size Mismatch CMOS Time and Date Not Set Diskette Boot Failure DMA Error DMA 1 Error DMA 2 Error FDD Controller Failure HDD Controller Failure INTR1 Error INTR2 Error Invalid Boot Diskette Possible Cause An error is occurring on the timer on the system board. The system configuration information in the system setup program is incorrect or the battery charge may be low. Corrective Action See "Contacting Dell" on page 370 for instructions on obtaining technical assistance. Enter the system setup program (see "System Setup" on page 280), verify the system configuration, and then restart the computer. Drive A or B is present but has failed the BIOS POST. Error in the DMA controller on the system board. Ensure that the drive is installed correctly in the computer (see the "Drives" section for your computer) and defined correctly in the system setup program (see "System Setup" on page 280). Check the interface cable at both ends. The keyboard or system board may need to be replaced. The BIOS cannot communicate with the floppy drive or hard drive controller. An interrupt channel on the system board failed to POST. Ensure that the floppy drive or the hard drive is installed correctly in the computer (see "Drives" section for your computer) and defined correctly in the system setup program (see "System Setup" on page 280). Check the interface cable at both ends. The keyboard or system board may need to be replaced. The operating system cannot be located on drive A or drive C. Enter the system setup program (see "System Setup" on page 280) and confirm that drive A or drive C is properly identified. 352 Solving Problems