Adding memory to sun x2200

I bought some memory upgrade kits for my SunFire x2200. When I pull the old chips (2x2g) and replace witht he new, the system will not boot, or at least won't give me screen. Works fine with the old ram. Any clues?

Bruce
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More about adding memory x2200
  1. DIMM Slots, Memory Type
    8 DIMM slots per processor
    Industry-leading 16 DIMM slots in an entry 1RU system
    Registered DDR2-667 ECC DIMMs (128 bit plus ECC databus)
    Supported Max Memory Configuration
    Up to 64 GB total memory supported
    System configurations from 1 GB up to 64 GB
    For optimal performance, install DIMMs in pairs

    Those are the specs for your system the new dimms are they ECC and DDR2 667mhz?
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