HP vc4725 Troubleshooting Guide: HP Compaq Thin Client vc4725 - Page 6

BIOS Error Messages Beep Codes Activity Beeps Green Power LED On 1 Beep Green Power LED On, and flash every 2 N/A sec. Red LED is ON. Long beep for 5 Secs and Shutdown. Pow erO N LED (D ualC olor-G reen/R ed) Possible Cause Recommended Action System On None System in Suspend to RAM mode or Normal Suspend mode. Press any key or move the mouse to wake the computer 1. Open hood, press powerDisplay button, and see if the system fan spins. If the system fan is not spinning, System Fan Problem ( Fan Blocked or Not running) make sure the fan's cable is plugged onto the system board header. 2. Ensure that no foreign objects are stuck in the System Fan. Red LED is Flashing.Beep 1 Sec.& off 2 sec. for 5 Simultaneous beeps. Beep Warning Pre-video memory error. Looping again after 10Sec. Red LED ON. Single long beep followed by two short beeps. Video detection and initialization error. 1. Reseat DIMMs. Power on the system. 2. Replace DIMMs one at a time to isolate the faulty module. 3. Replace the faulty module. 4. Replace the system board. 1. Replace the system board. POST Messages BIOS ROM checksum error System halted CMOS battery failed CMOS checksum error Defaults loaded Procedures The checksum of the BIOS code in the BIOS chip is incorrect, indicating the BIOS code may have become corrupt. To restore a corrupt BIOS, refer to or call your local HP Call Center for a diagnosis.: The CMOS battery is no longer functional. Checksum of CMOS is incorrect, so the system loads the default equipment configuration. A checksum error may indicate that CMOS has become corrupt. A weak battery may have caused this error. Replace the battery if necessary.