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?

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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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