Troubleshooting Symptom/Cure Tables:Startup Problems Before the Finder
Gray Screen In a “Gray Screen Raster” situation, you will get a normal startup boot chime and the
system will have a green LED. The display, however, will have a solid gray screen with
no cursor or desktop displayed.
Possible Cause Possible Fix
Corrupted system software. - Boot off the system CD that came with the unit. Do you
see a normal screen display now?
Yes: Reinstall system software. (You must use the
system software CD that came with the unit to get the
correct version of Mac OS.)
No: Go to next step.
The PMU chip or logic board
needs to be reset.
- Press the PMU chip on the logic board with the AC
power cord disconnected. (See “The PMU Chip” and
“Resetting the PMU on the Logic Board” mentioned
earlier in this chapter.)
- Connect the power cord and power on the system again.
Do you have power to the system now?
Yes: Test the unit with MacTest Pro and return the
computer to the customer.
No: Plug in the AC power cord and reset the PMU chip
again. Do you have power to the system now?
Yes: The battery is likely bad, check the battery.
No: Go to the next step.
Bad video cable connection. - Verify that the CRT video board and video board cables
going to and from the power/analog board are securely
attached. If the problem persists go on to the next step.
Bad SDRAM - Reseat/replace the SDRAM with known-good SDRAM.
Bad logic board - Replace the logic board.
Bad power/analog/video
board
- Replace the power/analog/video board.
Bad CRT -Replace the CRT.