|If it's not bad ram it could be a bios problem. I've noticed some older bios' have a problem with ram greater than 384 meg. It'll see the ram OK but there'll be a hardware error in device manager. The recommended solution is a bios upgrade but often there isn't one to upgrade to. The hardware error goes away when the ram is reduced.|
Also, I've seen some PC133 SDRAM that says it's only to be used with a 133 mhz bus. I don't know what's up with that as we accept that PC133 ram will run OK at 100 mhz, which is what your P-2 is running at. But maybe it was manufactured with a narrower range of allowed frequencies.