Memory install - CRC error - System Halted

I just bought 512MB DDR RAM for my machine (it can take up to 2GB, PC2100, 266MHz RAM and I checked it would work with it). Problem is, I boot up and get: CRC error - System Halted It then doesn't boot. However, if I replace the 512MB RAM with the 256MB (alone) the system came with, it boots up EVERY time. Now, I've tried 3 (yes 3) different lots of 512MB memory with this machine and none have worked... In fact, 2 have died trying to work this out... Any ideas? Paul ----------------------------------- Paul Johnston PJ Net Solutions Ltd http://www.pjnetsolutions.com paul@pjnetsolutions.com +44 (0)7866 573013