memory wont run in tandom

  bugzy-no1 22:20 23 Jan 04

hi just got a new memory stick for my pc to take it to 1gig (1.24) but on starting in with new stick it starts (dd channel active) counts out the memory to 1g + starts too boot up then stops the pc dead , both are 512 2700 at 333
both diffrent companyes both work indivigualy ok
i have a 250dd graph card on a gigabyte ga 7n400 pro2 board so it should be hunkydory but it aint
tryed difrent sockets and changing them about but allways the same lookin for ideias or help if someone else had same prob thanks in advance,

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