Troubleshooting Guide
Troubleshooting Guide www.hp.com A–9
POST Error Messages
1155-Serial Port 
Address Conflict 
Detected
Both external and 
internal serial ports are 
assigned to same IRQ.
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.
1201-System Audio 
Address Conflict 
Detected
Device IRQ address 
conflicts with another 
device.
Enter Computer Setup and reset the IRQ in 
Advanced > Onboard Devices.
1202-MIDI Port 
Address Conflict 
Detected
Device IRQ address 
conflicts with another 
device.
Enter Computer Setup and reset the IRQ in 
Advanced > Onboard Devices.
1203-Game Port 
Address Conflict 
Detected
Device IRQ address 
conflicts with another 
device.
Enter Computer Setup and reset the IRQ in 
Advanced > Onboard Devices.
1720-SMART Hard 
Drive Detects 
Imminent Failure
Hard drive is about 
to fail. (Some hard drives 
have a hard drive 
firmware patch that will 
fix an erroneous error 
message.)
1. Determine if hard drive is giving 
correct error message. Enter 
Computer Setup and run the Drive 
Protection System test under 
Storage > DPS Self-test.
2. Apply hard drive firmware patch 
if applicable. (Available at 
www.hp.com/support.)
3. Back up contents and replace hard 
drive.
1785-MultiBay 
incorrectly installed
(for integrated MultiBay/ 
USDT systems)
1. MultiBay device not 
properly seated.
2. MultiBay riser not 
properly seated.
1. Ensure the MultiBay device is fully 
inserted.
2. Ensure the MultiBay riser is properly 
seated.
Numeric Codes and Text Messages (Continued)
Code/Message Probable Cause Recommended Action










