Universal Serial Bus (USB) port problems
v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See the parts listing in the Problem Determination and Service Guide to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by “(Trained service technician only),” that step must be performed only by a
trained service technician.
Symptom Action
A USB device does not work.
1. Make sure that:
v The correct USB device driver is installed.
v The operating system supports USB devices.
2.
Make sure that the USB configuration options are set correctly in the
Configuration/Setup Utility program menu (see the User’s Guide for more
information).
3. If you are using a USB hub, disconnect the USB device from the hub and
connect it directly to the server.
4. Move the device cable to a different USB connector.
Video problems
See “Monitor problems” on page 68.
Light path diagnostics
Use light path diagnostics to diagnose system errors. The light path diagnostics
panel is behind the operator information panel, on the left front of the server. To
access the light path diagnostics panel, slide the release latch on the front of the
operator information panel to the left.
The following illustration shows the controls and LEDs on the light path diagnostics
panel.
DASD
NMI
PCI
PS1
SP
PS2
CNFG
MEM
CPU
FAN
VRM
OVER SPEC
TEMP
REMIND
S ERR
Light Path
Diagnostics
RAID
BRD
To acknowledge a system error but not take immediate action, press the remind
button to place the server in Remind mode. When the server is in Remind mode,
the system-error LED on the front of the server flashes. If a new failure occurs, the
system-error LED is lit again.
74 IBM System x3650 Type 7979: Installation Guide
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