Apple powermac g3 blue.white Manual Do Serviço

 

 Troubleshooting

Symptom Charts/Video and Sound - 42

 

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.