Power Mac G5 1.8 Ghz Dual - fans come on but no power lights

Power Mac G5 1.8 Ghz Dual - fans come on but no power lights. My hunch is that it is the power supply but as the system will not boot I can not run diags or check logs. I appreciate any help.
Thanks
Jeff

No power (LED on/off, no fans, no boot tone, no video)
1. Check power supply cables
2. Check logic board power rails
3. Check processor connector
4. Check logic board tape for dual config
5. Replace power supply
6. Replace processor
7. Replace logic board
No boot (LED on/off, fans spin, no boot tone, no video)
1. Replace memory
2. Replace logic board
Memory (blinking LED, fans spin, no boot tone, no video)
1. Check memory config and replace DIMMs
2. Replace logic board
No boot tone (LED on, fans spin, no boot tone, video) or
No video (LED on, fans spin, boot tone, no video)
1. Reseat video card
2. Replace video card
3. Replace front panel board cable
4. Replace speaker
5. Replace front panel board
6. Replace logic board
Duct door sensor
1. Reseat interlock sensor board cable
2. Replace interlock sensor board
3. Replace logic board
4. Replace enclosure
-Bmer
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