faulty or improperly seated. Reinstall the memory modules (see "Memory" on page 115) and, if necessary, replace them.
M E M O R Y W R I T E / R E A D F A I L U R E A T A D D R E S S , R E A D V A L U E E X P E C T I N G V A L U E — A memory module may be faulty or improperly seated. Reinstall the memory modules (see "Memory" on page 115) and, if necessary, replace them.
N O B O O T D E V I C E A V A I L A B L E — The computer cannot find the hard drive. If the hard drive is your boot device, ensure that the drive is installed, properly seated, and partitioned as a boot device.
N O B O O T S E C T O R O N H A R D on page 142).
D R I V E — The operating system may be corrupted. Contact Dell (see "Contacting Dell"
N O T I M E R T I C K I N T E R R U P T — A chip on the system board may be malfunctioning. Run the System Set tests in the Dell Diagnostics (see "Dell Diagnostics" on page 73).
N O T E N O U G H M E M O R Y O R R E S O U R C E S . E X I T S O M E P R O G R A M S A N D T R Y A G A I N — You have too many programs open. Close all windows and open the program that you want to use.
O P E R A T I N G S YS T E M N O T F O U N D — Reinstall the hard drive (see "Hard Drive" on page 108). If the problem persists, contact Dell (see "Contacting Dell" on page 142).
O P T I O N A L ROM B A D C H E C K S U M — The optional ROM apparently failed. Contact Dell (see "Contacting Dell" on page 142).
AR E Q U I R E D . DLL F I L E W A S N O T F O U N D — The program that you are trying to open is missing an essential file. Remove and then reinstall the program.
1Click Start→Control Panel→Add or Remove Programs.
2Select the program you want to remove.
3Click Remove or Change/Remove and follow the prompts on the screen.
4See the program documentation for installation instructions.
S E C T O R N O T F O U N D — The operating system cannot locate a sector on the hard drive. You may have a defective sector or corrupted FAT on the hard drive. Run the Windows
Windows Vista® Start button 
→Help and Support. If a large number of sectors are defective, back up the data (if possible), and then reformat the hard drive.
S E E K E R R O R — The operating system cannot find a specific track on the hard drive.
S H U T D O W N F A I L U R E — A chip on the system board may be malfunctioning. Run the System Set tests in the Dell Diagnostics (see "Dell Diagnostics" on page 73).
TI M E - O F - D A Y C L O C K L O S T P O W E R — System configuration settings are corrupted. Connect your computer to an electrical outlet to charge the battery. If the problem persists, try to restore the data by entering the system setup program (see "System Setup Program" on page 93). Then immediately exit the program. If the message reappears, contact Dell (see "Contacting Dell" on page 142).
TI M E - O F - D A Y C L O C K S T O P P E D — The reserve battery that supports the system configuration settings may require recharging. Connect your computer to an electrical outlet to charge the battery. If the problem persists, contact Dell (see "Contacting Dell" on page 142).
TI M E - O F - D A Y N O T S E T - P L E A S E R U N T H E S YS T E M S E T U P P R O G R A M setup program does not match the system clock. Correct the settings
—The time or date stored in the system for the Date and Time options (see "System
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