Netboot clients turns themselves off after globe goes to "wheel"

Hello
I have 20 G4 machines in a computer lab that I am in charge of (just got this on my list of stuff to do), and I am trying to get them to boot on NetBoot.
It works. They run osX .4.10. MOST of them. Some of them does this:
1. Press "N" and computer goes to "Network Boot"
2. Flashing globe appears
3. Flashing globe gets replace with apple symbol and spinning smaller globe
4. Spinning globe disappears
5. --- this is where the "wheel" symbol should come on, but...
6. Computer gets a "black window" pretty much where the "Starting OS X" splash screen is supposed to go, and then it turns itself off.
The computers do not reboot, they just power down. Bam!
The computers that do boot works beautifully!
After the globe stops spinning on these, the wheel shows for about 30 secs, and then the OS X GUI loads with no hassle...
Any ideas why just some of them refuse to boot?
Is there any way to get the boot to be "verbose" when netbooting?
Can I dump errors etc to file on boot?
Cheers,
Tomas
Message was edited by: Grefven

Allright, this is the progress so far:
I cannot, not even on local booted media (FireWire) get the computer to start with MacOS X. The computer next to it, the exact same model, does. I bought an external LACie FW drive and installed OS X 10.4.11 on it. Booted, used NetRestore to create an image of the local HD, moved the FW to the computer next to it, booted off the FW, restored drive. Works perfectly! Moved the FW drive to next computer. Tried to boot, and computer shuts itself down.
At boot, the grey apple appears in the middle of the screen for a short while, and then a "wheel" starts spinning under it. After a while it boots into OSx. This is on machines that work. The machines that does not work, powers down when the "wheel" is going to appear. BAM! Power down. No reboot, lockup, sounds, text, no nothing - just plain power off, as if someone pulled the power chord.
Any ideas? What can be wrong? Hardware is manufactured at the same time. Same size harddrive, same graphix card, same memory config, same memory capsules, same peripherals, same everything... but it just simply powers down, while the other works flawlessly. I have 20 machines and about half of them boot fine, and the other half powers down when I try.
Next try will be to buy (yet again buy stuff... sigh...) an external firewire DVD (the G4 machines only have CD-readers and OS x is on DVD-Media), and try to boot and install from that.
Would be nice if any of you can tell me what's wrong before I have to buy new stuff
Cheers!
Tomas "The Frustrated Tech" Monsén, Sweden

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