iMac G5 Freezes After Startup Even After Hard Drive Replacement

My Imac G5 was freezing up during or after start-up. I sometimes reached the desktop and it would freeze. I got onto the internet a couple of times before it froze, as well. I also got the lines going across the screen (in random/intermitent patterns). I found a few sites that stated the problem was likely the hard drive going bad, so I replaced the hard drive and still get the same problems. I tried various scans and fixes like the ones in Disk Utility, but still the same problem with the freezing and lines across the screen. The hard drive is now a new one, so is this still a hardware issue? I even tried a fresh OS install on the old hard drive (no changes) and the buyer of the new hard drive did a clean install of Snow Leopard.

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Is you new HD SATA 1 (1.5GB/s)? If not, it could still be a hard drive issue. SATA II drives can work with this machine... SATA III drives probably wont.

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Connect to an external monitior. If the lines don't go away you have a video card problem dealing with this issue is an advanced DIY project.

If the lines do go away the problem could one of a couple internal components... a cable or the LCD.

The freezing could be your CPU or RAM.

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Thanks, I'll try that and let you know what happens.

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