3-14 Sun Blade 1500 Service, Diagnostics, and Troubleshooting Manual • December 2004
Front of system
chassis
Upon power on, three
beeps and the system
powers off
Invalid configuration.
Memory or CPU does not
match requirements.
See “Memory Problem”
on page 4-37 or
“Motherboard
Problem” on page 4-34.
Upon power on, four
beeps and the system
powers off
FRU ID checksum error. Replace motherboard.
See
“Replacing the
Motherboard” on
page 11-43.
Upon power on, five beeps
and the system powers off
Internal reset failed. See “Motherboard
Problem” on page 4-34.
Continuous beeping Keyboard key is stuck or
connection is bad.
See “Keyboard
Problem” on page 4-19.
Quiet scratching hard drive heads are moving. Hard drive is normal.
High-pitched humming hard drive bearings are
failing.
Replace the hard drive.
See
“Replacing a Hard
Drive” on page 12-2.
Front or rear of
system chassis
Low shrill sound Front fan bearing is failing. Replace front fan. See
“Replacing the Front
Fan” on page 13-8.
Rear fan bearing is failing. Replace rear fan. See
“Replacing the Rear
Fan” on page 13-15.
Power supply fan bearing is
failing.
Replace the power
supply. See
“Replacing
the Power Supply” on
page 13-2.
Quiet grumbling sound Temperature is such that fans
are barely turning.
Fans are normal.
Silence from fans Front fan is not spinning.
Rear fan is not spinning.
See “System Fan
Problem” on page 4-9.
Power supply fan is not
spinning.
See “Power Problem”
on page 4-6.
TABLE 3-5 System Sounds at Locations and What They Mean (Continued)
Location Sound Meaning Comment
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