Specifications

Power Mac G5 (Late 2004) Troubleshooting - 9
Symptom Charts
9. Test whether the front panel board or power button is at fault. Remove the installed
front panel board and swap it for the known-good front panel board in the front panel
board troubleshooting tool. Then connect the troubleshooting tool to the logic board of
a known-good Power Mac G5 and start it up using the tool. If the computer does not
start up correctly, go to step 10. Otherwise, go to step 11.
10. Replace front panel board
11. Replace power button
12. Replace logic board
Power-on LED illuminates when power button is pressed but fans do not spin
(or spin only momentarily) and there is no boot tone or video
1. Reseat video card. (Make sure video card is fully inserted in connector and end of
card is secured by the connector latch.)
2. Reset the logic board. Refer to “Resetting the Logic Board” in this chapter.
3. Verify power supply cables are fully connected
4. Check for trickle voltage on the power supply connector. Refer to “Power Supply
Verification” in this chapter. If verification fails, replace power supply.
5. Replace logic board
Power-on LED illuminates when power button is pressed and fans spin
continuously but there is no boot tone or video
1. Reseat video card. (Make sure video card is fully inserted in connector and end of
card is secured by the connector latch.)
2. Verify speaker cable is fully seated.
3. Reset the logic board. Refer to “Resetting the Logic Board” in this chapter.
4. Replace logic board
Power-on LED illuminates when power button is pressed, fans spin, and boot
tone chimes, but there is no video
1. Reseat video card. (Make sure video card is fully inserted in connector and end of
card is secured by the connector latch.)
2. Reset PRAM (restart computer while holding down Control-Option-P-R keys until
second boot tone chimes)
3. Replace video card
4. Reset the logic board. Refer to “Resetting the Logic Board” in this chapter.
5. Replace logic board