G4 MDD 867 DP Locks Up with Blinking DS18 LED!!!

"is this a RAM issue? "

Pull the sticks out one at a time and boot the machine.

LED DS18 should mirror the power button LED ( aside from sleep pulsing ).

1 blink no RAM detected

2 blinks Incompatible RAM type(s) installed

3 blinks no RAM passed memory testing

4 blinks Boot ROM image corrupt

5 blinks Processor error

Here’s a diagram of the logic board.

G4 Mirrored Drive Doors
http://img470.imageshack.us/img470/1623/mddlogicbd4ga.jpg

 Cheers, Tom

This info is included in the MDD Service Manual.

Error tones occur before system software loads are loads.

Computer beeps once at startup
One beep means that no RAM is installed or detected.

1. If no DIMM is present, install a kno known-good DIMM in the top slot and try again.
2. Reseat the DIMMs.
3. Replace the DIMMs one at a time and test until all bad DIMMs are replaced with known-good modules.
4. Check that the processor module is properly installed.
5. Replace the processor module module.
6. Replace the logic board.

Computer beeps two times at startup
Two beeps mean that incompatib o incompatible RAM types may be installed. Verify that only DDR266 SDRAM DIMMs are installed.

1. Replace the DIMMs one at a time and test until all bad DIMMs are replaced with known-good modules.
2. Check that the processor module is properly installed.
3. Replace the processor module module.
4. Replace the logic board.

Computer beeps three times at startup
Three beeps mean that no RAM banks passed memor memory testing.

1. Replace the DIMMs one at a time and test until all bad DIMMs are replaced with known-good modules.
2. Check that the processor module is properly installed.
3. Replace the processor module module.
4. Replace the logic board.

Computer beeps four or five times at startup
Four or five beeps mean that the ROM is probably bad and cannot be fixed.

1. Replace the processor module module.
2. Replace the logic board.

 Cheers, Tom