I Mac G5 locks up and wont boot up

I have been having a problem with my 2005 IMac G5. It has been an ongoing problem since I bought the computer. The problem starts when the computer locks up and needs to be powered down, after which it will not boot up again. I get a gray screen with a flashing ? mark and the fan goes into hyper drive. I have tried all the tips in troubleshooting; resetting the PR, looking at the led lights, etc. It will not start up in safe mode.
While it was under warranty, the apple store replaced the hard drive and re-imaged the hard drive several times. Since it is out of warranty the only thing the store will do is re-image the hard drive which fixes the problem for maybe a day or two and then the computer locks up again I have the maximum amount of memory in the machine so when it is working it is fast. I heard there was a problem with the airport wireless card in these machines. Could that be the problem or could the hard drive be bad? I hate to throw this computer away because it was hardly used. Thanks for any comments.

Don't throw it away, clone the drive to an external and then put a new drive in the iMac, and then revere clone from your external.

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my iMac was updating latest iphoto raw compability update,
then my imac turn into around 3 hours machine that frezee up after 3-4 hours of normal used (itunes and brosing),
and it wont shutdown, I force the power button to make it off.
after that,
it wont boot to mac osx SL
flashing folder with question mark on it appear.
but I certainly could boot from SL installation DVD,
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if less than half hour, it wont boot to mac osx..
how strange is that?
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can anyone fix this?
I thought this problem connect with my bootcamp with win7,
because I can't boot to win7 also,
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anyone can help me?
is format it all will help?
Message was edited by: Hudi

Before deciding that you can't replace the drive yourself, visit the following site and find the step by step instructions for replacing the drive yourself:
http://www.ifixit.com/
If you see the instructions and feel that you can replace the drive yourself, you will save money that way. I'm not that familiar with modern iMacs, but I know it was very easy to replace the drive in my old iMac. It may not be as hard to do as you think. If you want extra help, you can post questions on the iMac forum.
If you still don't feel like it is something you can do yourself, try looking for an AASP (Apple Authorized Service Provider) in your area and see what it might cost to have the AASP do the replacement. Often an AASP can do a repair for less money than Apple, and they will usually be willing to install a drive that you have obtained elsewhere for a reasonable price. From what I have read on these forums, many people have used AASP's to install bigger and faster drives on their machines.
Definitely contact Western Digital about your drive. Usually WD drives come with a 3 year warranty, and if the drive fails before then, WD will replace the drive. KT has mentioned that the drive apparently is not under warranty, but might qualify for some sort of an upgrade. Before shopping elsewhere, check to see if this upgrade might entitle you to a very good deal on a replacement drive or something of that nature.
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I Mac G5 locks up and wont boot up

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