Start up Issues with a G4 MDD DP1250mhz

I left my Mac a moment, when I returned the monitor was a bunch of vertical lines, I forced a restart using power button, I get start up chime, power button lights up, red led on mother board lights up, cooling fan runs as does fan on video card (Nvidia G force 4), but there is no power to HDDs, CD/DVD, Video or USB (keyboard and mouse). Tried PMU reset, checked battery (ok), removed battery for 10mins nothing has made any difference, also tried different monitor.
Any ideas would be appeciated, I'm stumped!
Also machine powers down if you hold in power button, as it should.
Message was edited by: Not very bright

Hi-
Welcome to Discussions!
Will the machine boot to Safe Mode (hold Option while starting)?
Will the machine boot to the OS X install disc (insert into drive, and hold C while starting)?

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Start up Issues with a G4 MDD DP1250mhz

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