After Replacing Hard Drive, iMac Freezes after about 40 Minutes.

I have a flat panel 15" iMac which had a bad hard drive. I replaced it with a 250 gig Seagate ATA drive. I used the Disck utility to format it and the computer recognized the correct size of the Drive. After installing OS 10.4.7 on the drive I found that the computer locks-up or frezzes after about 45 minute. I have run apple diagnoxtics and the computer hardware and ram checks out fine. I found that the computer does not lock up if I runit form an external firewire drive with os 10.x and it did not lock-up when I booted form the OS 9 Hardware test cd. I then thought that maybe I had loaded the OS x poorly on th e new drive so I reloaded the OS. The system agin freezes agter the system is on for about 30 + minutes.
Do I need a special drive or size for the G4 flat panel iMac? Is there a setting on the Segate Drive I need to set.
Any Thoughts\
Jim
G4 Dual 1.25   Mac OS X (10.2.x)  

Hello,
There should be a Master / Slave setting on the drive. If it shares the same "channel" with your CD-ROM drive, then you may need to set the Hard Drive as Master.
Check your original drive, and see what it was set to. There is a Master, Slave, and Factory setting.
Look at the label on the drive, and compare that to the jumpers (little caps) on the back of the drive by the data cable connector.
Set your new drive to match the same setting your original drive was set to.
If that doesn't work, try your new drive in the external drive enclosure. See if it works right there.
If it still doesn't work right, then perhaps you got a drive with a defect.
If it works fine in the external case, and you have verified that your settings are right when used internally, then you may have damage in the iMac's logic board or hard drive controller somewhere.
But, take a look at the Jumper Settings, and try it in the external enclosure as well. See if either of those fixes it.
Hopefully you just got the jumper settings wrong.
I hope this helps.

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