Stuck on grey screen and wild fans

I just restarted my powermac G5 this morning after installing the ilife and keyboard updates and it gets stuck on the grey screen with grey apple and then the fans start winding up and the machine sounds like it's going to take off down the run way.
I have tried to start it a couple of times and the same thing happens, even disconnected the external drives and things with no luck.
can anyone have a solution? what s going on with it?

Try using Disk Utility to do a Disk Repair, as shown in this link, while booted up on your install disk.
You could have some directory corruption. Let us know what errors Disk Utility reports and if DU was able to repair them.
If that doesn't do it, Try things in Apple doc.#106464 for your startup issue. The article says it is for 10.3.9 and down but it still applies to 10.4 systems.
Also, try using Disk Utility to do a Disk Repair, as shown in this link, while booted up on your install disk.
Let us know what errors DU reports and if it was able to repair them.
Cheers!
DALE
Cheers!
DALE
Message was edited by: Dale Weisshaar

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Hello,
I wonder if anyone can help me.
I have an old Powermac G4.
On starting up, the chime sounds and the screen turns to grey and shortly after the apple symbol appears as per normal.
However, it then remains stuck on this screen and shortly after the fans (I assume its the fans) start making a very loud noise.
I purchased this computer second hand, from a company who were about to throw it away because of this problem.
At the time I called an apple engineer who came round and fixed the problem, as I remember fairly quickly.
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I moved home recenly and transported the computer (safely and securely) in the back of the car. However, on set up the problem had re-occured.
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Just hold t key down while powering up for Target mode.
Unless you have...
Firmware password protection in Mac OS X ...
http://support.apple.com/kb/HT1352
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Unfortunately this means that there is a problem in the boot sector of your hard drive. It might be indicative of a fundamental corruption in the coding that allows your computer to boot your operating system from your hard drive. I had this problem twice and it resulted in me having to get a new hard drive and restore my data.
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"Try Disk Utility
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Stuck on grey screen and wild fans

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