I took out the old RAM chips which were left in with the newer ones. This left the computer with 2X32 RAM chips.
Did you try switching the location of the 2 ram chips (ie. put them where the old chips were located)?
Please post any info you have on all 4 chips. What are the speeds of the 4 chips? Everything was working fine on this machine before you replaced the hard drive? Do you still have the old hard drive?
Instead, I suspect that the new memory is out of your motherboard's specified range.
DRAM speed ratings are often misunderstood. Some people think you can improve system performance by installing memory that is rated faster than the memory you currently have. Faster memory may work, but it won't result in any speed increase.
The speed rating of a memory chip refers to how fast the memory can be accessed. If you put in memory that is slower than specified for your system, you will get errors (or the system will lock up), because the memory cannot respond quickly enough to requests from the CPU. If you put in memory that is slightly faster than what's specified for the system, it may work without a problem, because the memory is able to respond faster than the CPU requests (though you are wasting money on faster memory, because slower memory would work just as well).
If the memory is too fast, however, you may run into problems because it is not being refreshed frequently enough. In this case, the original 80-ns RAM was replaced with 70-ns RAM. If the motherboard isn't able to get to the memory fast enough, the result could be memory problems like the ones experienced by this reader. Disabling the system cache could speed up memory access enough for the problems to be eliminated (because no time is wasted looking in the cache first). Some motherboards appear to be more sensitive to variations in memory speed ratings than others.
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