Computer wont start with 3 ram modules

i cant install 3 ram modules
1GB DDR2 555MHZ
1GB DDR2 444MHZ
1GB DDR2 800MHZ

Blue screen Appeared
3 answers Last reply
More about computer wont start modules
  1. if its dual channel then you have to use 2 sticks at a time and they all have a difrfrent speed so you cant do that it would be contradictory
  2. thanks
  3. but it worked before i install another 800mhz 1gb ram
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