Specifications

Power Mac G5 (Late 2005) Troubleshooting — Symptom Charts 146

Power-on LED illuminates when power button is pressed and fans spin

continuously but there is no boot tone or video

Reseat video card. (Make sure video card is fully inserted in connector and end of card is

secured by the connector latch.) For video cards that require power cables, check that they

are connected.

Verify speaker cable is fully seated.

Reset logic board. Refer to “Resetting the Logic Board” in this chapter.

Check diagnostic LED 1 and LED 6 for processor connection

Replace processor

Replace logic board

Power-on LED illuminates when power button is pressed, fans spin, and boot tone

chimes, but there is no video

Reseat video card. (Make sure video card is fully inserted in connector and end of card is

secured by the connector latch.) For NVIDIA Quadro FX 4500 graphics card, check that power

cord for card is connected.

Reset PRAM (restart computer while holding down Command-Option-P-R keys until second

boot tone chimes)

Reset logic board. Refer to “Resetting the Logic Board” in this chapter.

Replace video card

Replace logic board

Power-on LED does not illuminate when power button is pressed, but fans spin,

boot tone chimes, and there is video

Reseat front panel board

Replace front panel board

Replace logic board

Replace power supply

Power-on LED illuminates, fans spin up, no boot tone, and the system shuts down

within a few minutes

Check diagnostic LED 1 and LED 6.

Reseat the processor and check for bent pins

Replace the processor

Replace the logic board

Replace the power supply