G5 not seeing firewire hard drive on restart all of a sudden?

Recently I noticed my G5 not seeing my external 400GB fire drive after a restart or boot up. It has been connected since January and has not had this problem before. The only way it sees it is if I turn the drive off and on again, then it pops up on the desktop. Is there a preference somewhere that may have been turned off or on for this? If not, what do I need to do so that it sees it all the time? Help is greatly appreciated. Thanks!

I had a FireWire external case that became flakey on me. It was a really cheap one, so I guess I got what I paid for.
Symptoms are similar, though not exact. It would sometimes take 10 or more minutes for it to mount to the desktop after a startup (sometimes it would never mount). If I let it spin down during use, it would not spin back up upon attempted access. If it spun down during use, I'd start getting the +beach ball+ until I yanked it out without ejecting; it would not eject off desktop because it would not spin back up. I got the warning message about not ejecting first, but the beach ball went away immediately. It wasn't the drive inside, since it worked when I put it into another case later.
I've read some negative reports recently about Western Digital external drives and problems working with Macs. I think I also read about a firmware upgrade for their external drive (can't remember positively). You may want to look at their support web page.
If you had another external FireWire drive or another Mac to plug that drive into, you could do some more conclusive tests to see if it's the Mac or the drive causing the problem.
Personally, I avoid buying external drives made by companies that cater to Windows users. Western Digital makes excellent drive mechanisms; most of my current drives are WD. However, I wouldn't buy an external drive enclosure from WD, Seagate, or Maxtor. I think they have Windows-centric features that interfere when operating with Macs. I now choose external drive enclosures from Mac-oriented companies like OWC, LaCie, MacAlly, G-Drive, and some others.

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Thank you. That's what I thought will need to happen.
One more question. I tried using the Apple install disk that came with the computer. It's an OS 10.5.6 disk. It does not see my 10.6.8 system internal hard drive to repair. All it see's is itself 10.5.6 disk. Do you think I can use a 10.8+ disk utillity since that is a higher system it will see the 10.6.8. Where the 10.5.6 does not?
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Thanks for your help, I know I will eventually need to re-install. But I am in the middle of a project with tight deadlines and all I can do right now is back-up. Trying to migrate to another computer temporarily to finish the job. That's a lot of extra work in the short time also.
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Cantobellus:
So I changed out the hard drive and the computer worked fine for 3 days and then it did the same thing.
This seems to suggest that your HDD may not be the problem. Try the old HDD you removed by putting it in a firewire enclosure and connect it to the computer and see if you can boot the computer from it. I experienced a similar issue with a iBook G4 which is detailed in the thread Could it be the logic board?. Your issue may be different, but the thread may give you some ideas for troubleshooting.
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ajkula66 wrote:
It never hurts to go over the basics:
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G5 not seeing firewire hard drive on restart all of a sudden?

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