Mac Mini G4 won't boot; fan full blast . . .

Hello!
I was using my G4 Mac Mini when it decided to re-boot itself, and on start-up, all I heard is 1 loud whrrring sound from the fan, a short pause, followed by continuous whrring sound from the fan going at full blast (very loud!). The screen shows nothing.
I've tried the troubleshooting steps in the Apple site but nothing seems to work. Each time I start it up, it does the same thing.
A few months back I'd the unit repair under warranty by Apple (replaced logic board). So it's quite frustrating to have it down again - and now it's out of warranty.
Any ideas?
Thanks.
Mac Mini G4 Mac OS X (10.4.8)
Mac Mini G4 Mac OS X (10.4.8)

It's perhaps telling that the problem occurred after the system forced a reboot. That tends to suggest there's a significant fault - likely hardware, since if the issue was with MacOS it would not be likely to cause the fan to ramp up to full speed on startup with the screen showing nothing.
You mention that you've tried troubleshooting steps, though not which ones. Likely, given that it features in G4 mini troubleshooting of startup issues, that would have included a PMU reset, but if you haven't yet tried that, do so. I would not hold out much hope that it will assist in this situation, but the power manager is the only hardware component that could cause this sort of potential issue, and the only one that can be reset by the user.
Assuming a PMU reset doesn't help at all, and since the system doesn't show any display, it's not worth trying to boot from the original install disk to run the hardware test since the system isn't even managing the power on self test, thus won't move on to loading MacOS. At that point, I'd say you should take the mini to an Apple store if you have one in your location, or to an Apple authorized service provider for them to give you an idea of what is wrong and what it would likely cost to repair it.
If you don't want to do that, the only option is to open the system and examine it yourself. The problem with that, however, is that there really aren't any user-servicable parts inside so other than checking that everything is correctly connected and properly seated, there's really not much else you can do.

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Tukaine
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Hard to troubleshoot when you can't turn on the computer on any more. One option is to bring it to an Apple store to have them look at it. They will tell you what is wrong and how much it will cost to fix. I have never heard of them charging for a diagnostic and an estimate.
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Hi,
my guess is the people at Best Buy may have broken it?)
My guess is since it was Open Box, somebody bought it, broke it trying to replace RAM, then returned it as they no longer wanted it.
Safe Boot from the HD, (holding Shift key down at bootup), if that doesn't work, try a Verbose boot, CMD+v
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""To update anyone watching this, we tried putting the hard drive in a different machine and still had the same boot issues,""
Are you saying that the questionable HD was put in another computer and THAT computer had the same issue as the Professors?
If so I would just backup and erase the hard drive, reformat and reinstall everything as something buggered up the Boot Manager and your going to take more time figuring it out as to redo everything.
I don't think the HD is going out but you MAY have some bad sectors on the Mac partition, if that's the problem then the bad sector might be in the bootable part and thats why it can't boot. If you want to save the HD have a disk utility do a Surface Scan to make sure.
As far as not being able to boot into Safe mode, etc, if it had a bad sector it won't be able to read the boot part which is why you can still boot into the Install DVD.
You know, looking back at your original post if you can't boot into safe mode while pressing the Shift Key after the bong, can't boot from an external HD or any of the other ways, then I would say it's a hardware problem.
Like I mentioned before, if you can put in another Dual boot HD from another machine into the Professors machine and it still won't boot into both OS's then you have confirmed it's a hardware problem.
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Hi,
Thanks for the response. I've been using Macs for a little over four years now but this is only the first time I have gone to the system logs (or any of the other logs available from the consolute utility).
The system log appears to be completely unhelpful. I got up this morning sometime after 6:00 a.m. and posted my first report (see above) at 6:48 a.m. (I don't have a record of the exact times of the boot up freezes.)
Following are the *entire* contents ot the system log covering this period:
Nov 19 01:12:15 WHW-Mac-Mini loginwindow[40]: loginwindow SleepWakeCallback WILL sleep
Nov 19 06:26:35 WHW-Mac-Mini loginwindow[40]: loginwindow SleepWakeCallback will power on, Currenttime:11/19/2012 6:26:35.019 AM - Waketime:11/19/2012 6:26:33.980 AM = Deltatime:1.038853049
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11/19/12 6:26:35 AM
kernel
Wake reason =
11/19/12 6:26:35 AM
kernel
System Wake
11/19/12 6:26:35 AM
kernel
Previous Sleep Cause: 5
11/19/12 6:26:35 AM
kernel
EIR is supported.
11/19/12 6:26:35 AM
kernel
SSP is supported.
11/19/12 6:26:37 AM
kernel
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0
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AppleBCM5701::selectMedium - autoselect, any duplex, flow control allowed
11/19/12 6:26:37 AM
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Ethernet [AppleBCM5701Ethernet]: Link down on en0
11/19/12 6:26:38 AM
kernel
Ethernet [AppleBCM5701Ethernet]: Link up on en0, 1-Gigabit, Full-duplex, Symmetric flow-control, Debug [79ed,0f00,0de1,0300,c5e1,3c00]
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bind() fd 25, family 30, port 123, scope 4, addr fe80::c62c:3ff:fe1f:4f7, in6_is_addr_multicast=0 flags=0x11 fails: Can't assign requested address
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unable to create socket on en0 (17) for fe80::c62c:3ff:fe1f:4f7#123
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network configuration changed.
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Authentication: FAILED :: User Name: N/A :: Viewer Address: 37.130.232.1 :: Type: VNC DES
Following this there were quite a few unsuccessful attempts to connect with my VNC server and little else that seemed noteworthy. Nothing that referenced anything to do with USB or USB peripherals.
And, of course, when I rebooted just now (in the hopes of getting a report from all of the logs corresponding to the exact time of the reboot), my Mini started just fine with no freeze up.

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