Troubleshooting
6-66
CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
Table 6- 4: Failure symptoms and possible causes (Cont.)
Symptom Possible cause(s)
PPC appears “dead”; power
light comes on, but monitor
screen(s) is (are) blank, instru-
ment emits no beeps
H SO DIMMs incorrectly installed or missing. Missing DIMMs
will cause a POST f ault and MicroATX will beep
H Defective Power PC (PPC) board
H Hold down on-standby button on the PPC, if syst em boots,
replace the power supply
Hard di sk drive related
symptoms
H Defective hard disk drive
H Incorrect hard disk type selected in the BIOS setup
H Replaceable hard disk drive not installed
H Power supply failure
H Corrupted BIOS module firmware, reinstall firmware
H Hard disk drive not configured as bootable (slave) master
hard di sk drive
H Loose cable
H Faulty bridge board
H Faulty PPC board
CD-ROM related symptoms H Defective CD-ROM
H Defective CD-ROM drive cable
H Defective CD-ROM board
H Incorrect CD-ROM configuration in the BIOS setup
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