IBM 4810-E3H, Installation And Service Manual

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2. Verify that any externally-powered I/O devices connected to an AC power outlet
are operating correctly and that the devices are powered ON.
3. Verify that the contrast and brightness controls on the video display (if attached)
are set correctly.
4. Observe the power indicator. The power indicator LED operation is shown in the
Table 7.
5. If the machine will boot, reboot the machine (without the USB memory key
installed) and listen to the beep codes. If a monitor is attached, observe the
system health check status. Refer to Table 8.
Note: Be sure to observe the customer-reported symptom prior to booting with
the memory key.
6. If the front USB port is disabled, use another USB port if possible. If booting
from the USB key is disabled, refer to 7a on page 30.
Power LED operation
The powered LED functions as an indicator of the system power state. Table 7
defines the operation of the power LED.
Table 7. LED operation
System State LED State or operation
Off (No AC supplied) OFF
Off - (AC supplied) Note: this state can be
entered by holding the power button down
for at least 4 seconds Blip (0.25 second ON, 1.75 seconds OFF)
On (POST) Blinking (0.5 second ON, 0.5 second OFF)
On (Normal operation after post '8B'h) ON
S1 (Standby) Blinking, (0.5 second ON, 0.5 second OFF)
S3 (Suspend to RAM) Blinking (0.5 second ON, 0.5 second OFF)
Beep codes
The following table describes the beep codes you may hear during servicing of the
4810/4910 SurePOS 300 and what the beep tones mean.
Table 8. Beep Codes
Beeps System state
Continuous tone immediately after powering
ON No memory. All inserted memory failed
One short beep after POST completion POST completed successfully
POST messages displayed to the system monitor
The following table summarizes all messages that may be displayed on the system
monitor during POST.
Problem determination
March 2009
Chapter 4. Problem determination
31