According to Hp website your computer will handle two 512 Mb RAM chips. Make sure they are PC133. If computer will not boot with both inserted properly, one of them is bad. Put one in slot 1 and none in slot 2 and see if it boots. Then switch the chips put the extra chip in slot 1 and none in slot 2. See if it boots. This way you can troubleshoot a possible bad chip.
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