HP ap5000 Maintenance and Service Guide: HP ap5000 All-In-One Point of Sale Sy - Page 28

Solving Power Problems continued, Table 4-2 - 7 beeps

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Table 4-2 Solving Power Problems (continued) Power LED flashes red 4 times, once every second, followed by a 2 second pause, and the computer beeps 4 times; beeps stop after 5th iteration but LEDs continue flashing. Cause Solution Power failure (power supply is overloaded). 1. Check if a device is causing the problem: a. Remove all attached devices (hard drives, optical drives, printers, displays). b. Power on the system. c. If the system enters POST, power off and replace one device. d. If system enters POST, power off and replace another device until the failure occurs. 2. If the problem persists with all devices removed, replace the power supply. 3. Replace the Head Unit. Power LED flashes red 9 times, once every second, followed by a 2 second pause, and the computer beeps 9 times; beeps stop after 5th iteration but LEDs continue flashing. Cause Solution The system power is on, but the computer will not boot. 1. Check if a device is causing the problem: a. Remove all attached devices (hard drives, optical drives, printers, displays). b. Power on the system. c. If the system enters POST, power off and replace one device. d. If system enters POST, power off and replace another device until the failure occurs. 2. If the problem persists with all devices removed, replace the Head Unit. 20 Chapter 4 Troubleshooting

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Power LED flashes red 4 times, once every second, followed by a 2 second pause, and the computer beeps 4 times;
beeps stop after 5th iteration but LEDs continue flashing.
Cause
Solution
Power failure (power supply is overloaded).
1.
Check if a device is causing the problem:
a.
Remove all attached devices (hard drives, optical
drives, printers, displays).
b.
Power on the system.
c.
If the system enters POST, power off and replace
one device.
d.
If system enters POST, power off and replace
another device until the failure occurs.
2.
If the problem persists with all devices removed, replace
the power supply.
3.
Replace the Head Unit.
Power LED flashes red 9 times, once every second, followed by a 2 second pause, and the computer beeps 9 times;
beeps stop after 5th iteration but LEDs continue flashing.
Cause
Solution
The system power is on, but the computer will not boot.
1.
Check if a device is causing the problem:
a.
Remove all attached devices (hard drives, optical
drives, printers, displays).
b.
Power on the system.
c.
If the system enters POST, power off and replace
one device.
d.
If system enters POST, power off and replace
another device until the failure occurs.
2.
If the problem persists with all devices removed, replace
the Head Unit.
Table 4-2
Solving Power Problems (continued)
20
Chapter 4
Troubleshooting