Specifications

Table C-1 Numeric Codes and Text Messages (continued)
Control panel message Description Recommended action
303-Keyboard Controller Error I/O board keyboard controller. 1. Reconnect keyboard with computer
turned off.
2. Replace the system board.
304-Keyboard or System Unit Error Keyboard failure. 1. Reconnect the keyboard with computer
turned off.
2. Ensure that none of the keys are
depressed.
3. Replace the keyboard.
4. Replace the system board.
501-Display Adapter Failure Graphics display controller. 1. Reseat the graphics card
(if applicable).
2. Clear CMOS. (See
Password Security
and Resetting CMOS on page 157.)
3. Verify monitor is attached and turned
on.
4. Replace the graphics card (if possible).
510-Flash Screen Image Corrupted Flash Screen image has errors. Reflash the system ROM with the latest
BIOS image.
513-Front Chassis fan not detected Front chassis fan is not connected or may
have malfunctioned.
1. Reseat front chassis fan.
2. Reseat fan cable.
3. Replace front chassis fan.
515-Power Supply fan not detected Power supply fan is not connected or may
have malfunctioned.
1. Reseat power supply fan.
2. Reseat fan cable.
3. Replace power supply fan.
660-Display cache is detected unreliable Integrated graphics controller display cache
is not working properly and will be disabled.
Replace system board if minimal graphics
degrading is an issue.
912-Computer Cover Has Been Removed
Since Last System Startup
Computer cover was removed since last
system startup.
No action required.
917-Front Audio Not Connected Front audio harness has been detached or
unseated from motherboard.
Reconnect or replace front audio harness.
918-Front USB Not Connected Front USB harness has been detached or
unseated from motherboard.
Reconnect or replace front USB harness.
921-Device in PCI Express slot failed to
initialize
There is an incompatibility/problem with this
device and the system or PCI Express Link
could not be retrained to an x1.
Try rebooting the system. If the error
reoccurs, the device may not work with this
system
POST Numeric Codes and Text Messages
105