Apple powermac g3 blue.white Manuales De Servicio
Troubleshooting
Symptom Charts/Video and Sound - 42
Video and Sound
Screen is black, but
boot tone is present,
drive operates, fan is
running, and LED is
lit
1 Check video cable/card connections. If using a VGA to
Macintosh adapter refer to “VGA-to-Macintosh Adapter”
earlier in this chapter.
2 Reseat SDRAM DIMMS. Make sure DIMMS are PC-100
DIMMS. Refer to “SDRAM DIMMS Do’s and Don’ts” in this
chapter.
3 Remove all SDRAM DIMMs and try replacing them one at a
time to test. Replace any bad DIMMs.
4 Check jumper block configuration at J25. Make sure jumper
block is correct color for processor type installed (see
“Jumper Location J25” earlier in this chapter for more
information). Also make sure the metal jumper pins are in
the correct position in the block and the block is installed in
the correct direction.
5 Clear parameter RAM. Hold down Command-Option-P-R
during startup but before “Welcome to Macintosh” appears.