Apple G4 manual

	Troubleshooting		Symptom Charts/ Error Tones - 46
Computer beeps twice		Two beeps means that incompatible RAM types may be installed.
at startup		Verify that only SDRAM DIMMs are installed. Use PC-100 DIMMs
		on Power Mac G4 (PCI/AGP/Gigabit Ethernet) and PC-133
		DIMMs on Power Mac G4 (Digital Audio/QuickSilvers).
		1	Run Apple Hardware Test. If the test finds bad memory,
			replace the DIMMs one at a time and test until all bad DIMMs
			are replaced with known-good modules.
		2	Reseat the processor module.
		3	Replace the processor module.
		4	Replace the logic board.
Computer beeps three		Three beeps means that no RAM banks passed memory testing.
times at startup		1	Run Apple Hardware Test. If the test finds bad memory,
			replace the DIMMs one at a time and test until all bad DIMMs
			are replaced with known-good modules.
		2	Reseat the processor module.
		3	Replace the processor module.
		4	Replace the logic board.