Speaking from personal experience, a large magnet won't do anything. If you want to _physically_ destroy the drive, hitting it with a hammer won't do it, either; you need to physically damage the drive platters inside.
My suggestion- drill through the case a couple of times. Most everything is made of aluminum, so it's fairly easy to get through with a standard cordless drill and, say, a 1/4" bit.
Otherwise, you could get the screwdrivers you need (usually a T-5 or-6, maybe a small hex head, sometimes a small Phillips. Take a close look at the screws holding the case together.) and take the thing apart. Interesting, educational, and the drive platters are pretty! I use them in my artwork. Once they're out of the case they're pretty useless informationally.
Try going over with a strong magnet. I if you want to be extra secure take a pair of plyers and snap the disk on the hard drive.
Are you recycling the computer as scrap, or are you giving it away to someone else as a working computer?
If the latter, simply boot from the installation CD; use Disk Utility in the Utilities menu to repartition your drive as one partition, with the option "write zeroes to the disk." You can choose one time, seven times, or more (really, one time is fine unless you're trying to outwit NSA). Then you can be sure that all your data is gone, but the system will still be perfectly usable by someone else.
If you are scrapping the unit, open it using the three screws at the bottom, separate the case, and remove the drive. You can destroy this however you want (I prefer hollowpoints).
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I'm aware you have an iMac G5. There are indeed three captive screws at the bottom of the case, recessed into holes, which you can unlock with a phillips screwdriver. This allows you to lift the rear case and stand off the front case.
You didn't make it clear in your original posting whether or not your machine was operational. Some people "recycle" good computers by donating them to charities, and these people often want to know how to destroy the data without desiring to destroy the physical drive.
I can't imagine a 6500 is of much use to the average person. I keep a PowerMac of that vintage in my shop because it has a floppy drive that is able to read 800K diskettes (which modern USB floppy drives won't do) and I occasionally get someone who comes in needing their records off old diskettes, or perhaps an external SCSI drive.
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A strong magnet will not be as effective as a hammer.
If you have a strong magnet, run it over the entire drive. then hit the thing with a hammer until it's plenty dented, then cut into it with a hacksaw if you really want to be sure to get at the internal components of the drive.
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I have an Imac G5. I don't see three screws at the bottom.
The reason I had to replace it with a new one was that the logic board had to be replaced at too high a cost. How do I work with a computer with a bad logic board? Thank you.
I also have a Power Mac 6500, with 8.6 OS. Do you think that it is of any use to anyone? It works just fine and I use it for some records I keep because it has a floppy drive.
I also have to do something with an old Mac LC. Would it be of any interest to a collector, or should I just recycle?
I'm going to have to move to smaller place and won't be able to keep the Power Mac and LC. Thanks
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