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Apple emac ati usb2 2005 Service Manual

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38 - eMac ATI Graphics/USB 2.0/2005 Troubleshooting
No Video Symptom Charts
No Video
No video to the internal display, the fan is spinning, there is drive activity
1.
Reset parameter RAM. Press Command-Option-P-R during startup.
2.
The system software could be damaged. Start up from the system CD that came with the computer.
3.
Remove the user access door.
4
Touch a metal surface inside the computer.   
5.
Disconnect the A/C power cord. Press the PMU reset (circled below) on the logic board. Refer to “How 
to Reset the PMU on the Logic Board” mentioned earlier in this chapter.
6.
Check for external video. Connect an external monitor to the video out port. Did you get external 
video? If yes, replace the display/analog assembly. If no, go on to the next step.
7.
Replace the logic board.