Mac Mini G4 shuts down during boot-up

Hi All,
Just upgraded a G4 Mac Mini to Leopard, all was going fine until today. I just ran software update to install the very latest Security Update along with MobileMe and now the following happens: the machine starts to boot up as normal - grey screen, dark grey apple, progress spinner for about 30 seconds, then the whole thing just shuts down. Happens every time now.
I haven't yet had chance to boot from the Leopard DVD but are there any smart bods out there with a similar experience who can give me a clue as to what's happened...? I've just spent the last 24 hours getting Leopard and various bits of software installed!
Thanks!
JF

Sorry to hear about the loss of the iTunes library, though if you had another Mac available you might find the files are recoverable by getting the mini into firewire target disk mode. If Disk Utility found difficulty with the catalog rather than widespread data corruption, much of the data on the drive may be recoverable despite DU's inability to effect a repair.
I think you are right however to go the erase and install route to get the system back into service. Utilities such as Tech Tools and Disk Warrior can often effect repairs, but there is nothing as good as a reformat and reinstall in terms of reliability, and creating confidence in the system's on-going use.

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Invalid node structure
I'm pretty sure you need more then Disk Utility to repair the drive.
http://www.alsoft.com/diskwarrior/index.html
Assuming you have Snow Leopard installed, you can try reinstalling the Mac OS but you'll have to do this from another Mac.
http://support.apple.com/kb/HT3910
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N200 shuts down during boot

Dear Lenovo,
I have a problem with my N200 laptop. Notebook shuts down during boot. Sometimes it is immediately after "Lenovo screen", sometimes it is when Vista logo appears. I found out that this is always when notebook is "cold". It does't matter if I want to switch on my notebook or if I want to restore it from hibernation or sleep mode. Next thing is that it always crashes when fan starts work at full tilt (I checked the fan but it is clear). When notebook starts correctly then it works without problems. Usually I have to switch it on about three times then it is OK. This problem takes about 2 weeks. I have my laptop about 7 month. Do you have any ideas how to solve this problem?
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Hi , Sounds like the power supply , when a load is put on the supply it does not seem to be able to cope with the correct output . You can buy a new supply ( same watt output or better )eg; if you have a 400watt supply get 400watt or higher supply as replacment . Checkurtech
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Good catch. I would never have though of that since I eagerly anticipate each chance I get for a clean install.
I much prefer to get a clean start and consciously change the things I need to work - often I find that the defaults really are better and would otherwise be stuck in habit...

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Yes, a glitch with any less-interruptable power supply — they're never truely uninterruptable — could well trigger this outage.
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Computer sometimes shuts down during boot, help please.

Hey guys,
My specs:
2500K @ 4.5 GHz 1.37V (12 Hours P95 stable + 10 IBT passes)
MSI Z77A-GD65
8GB DDR3-1600 Corsair Vengeance (2x4GB)
EVGA GTX680 Superclocked
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WD 1TB Caviar Blue
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My Overclock is raw, I have disabled, EuP 2013, C1E, EIST, Overspeed Protection, Intel C-State.
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Which leaves me with the Power outlet. I am using an outlet splitter and currently there are 7 products connected to 1 socket:
1. PC
2. Yamaha RXV-471 Receiver
3. Morel Sub-8 Subwoofer
4. PS3 (Off 99% of the time)
5. Internet Modem/Router
6. TV Box
7. 42" LED TV Screen
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I have 1 other clear outlet next to the one being used and I'm fairly certain they both go to the same place in the panel because they are adjacent.
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Quote from: xmad on 27-March-13, 01:37:42
That's normal, the memory you have is 1333 with an overclock profile of 1600. (XMP) The double cold boot has been an issue for ages on the z77a-gd65 although I thought it was corrected by the latest bios's.
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Hi there,
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egunay wrote:
Actually the computer is 2 weeks old, I spilled the beer 2 days ago.
Immediately disconnect all peripherals, power cord & remove the battery. Turn the computer over with the lid partly open and the hinge facing upward to let the liquid drain. Do not flop it over and lay it flat - you want to separate it from the moisture. Place paper or cloth towels under the machine to sop up the mess.
After the computer disgorges whatever you spilled on it, don't turn it on for 72 hours or longer. You want to computer to dry out completely before turning it on again.
Some users here swear by hairdryers. Blow drying the innards may bake whatever was in the liquid onto delicate computer components. Better to let the computer air dry.
Use plain tepid water to clean out the computer. If you spilled iced beverage more than likely this ice fried the hot motherboard.
Sugary, acidic or milky drinks will almost always cause problems later on as the residue starts slowly corroding the computer innards.
Swab down any sticky parts with distilled water or denatured alcohol.
If none of the above works, you will need to take the computer to a repair shop. Apple Care does not cover liquid or food damage. Believe me, they can tell. So the old "my computer stopped working" line is not going to work.
In order to not void your warranty any further, take it and let the staff clean it. It's worth it for a 2 week old computer. In the future, avoid eating and drinking while using your computer. Will avoid future heartache and expense.

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Welcome to Apple Communities
http://www.reedcorner.net/understanding-upgrade-nightmares/ Do a PRAM and SMC reset and see if it appears

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The problem with diagnosing this issue is that it's neither clear what was wrong with the system when it was repaired, nor what was done to resolve it at the time. While these events may have nothing to do with the present issue, they may be directly related.
As an example - you say that the system was not hot when it recently shut itself down, but had the repair involved removal of the logic board and the thermal pad wasn't replaced (as described as a requirement in the service notes) then it would render the system far more likely to apparently random shutdowns, because heat would build up more quickly and trigger protective mode with little apparent heating. That would also explain why the restart options don't seem to work.
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Mac Mini G4 shuts down during boot-up

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