A–8
www.hp.com
Troubleshooting Guide
POST Error Messages
918-Front USB Not
Connected
Front USB harness has
been detached or
unseated from
motherboard.
Reconnect or replace front USB harness.
919-Multi-Bay Riser
not Connected
Riser card has been
removed or has not been
reinstalled properly in the
system.
Reinsert riser card.
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
1151-Serial Port A
Address Conflict
Detected
Both external and
internal serial ports are
assigned to COM1.
1. Remove any serial port expansion
cards.
2. Clear CMOS. (See
Appendix B,
“Password Security and Resetting
CMOS.”
)
3. Reconfigure card resources and/or
run Computer Setup or Windows
utilities.
1152-Serial Port B
Address Conflict
Detected
Both external and
internal serial ports are
assigned to COM2.
1. Remove any serial port expansion
cards.
2. Clear CMOS. (See
Appendix B,
“Password Security and Resetting
CMOS.”
)
3. Reconfigure card resources and/or
run Computer Setup or Windows
utilities.
Numeric Codes and Text Messages
(Continued)
Code/Message
Probable Cause
Recommended Action
