I am installing new RAM pc133 on a gateway professional 700mhz celeron it originally came with 64 megs of ram i called gateway and they said I can use any kind of pc133. I put 256 in the computer and nothing came up on the screen. I then tried 2 sticks 128mb each and still the same thing. Then I tried the 64mb that came with the computer mixed with one of the 128's and it worked. I was installing xp home on the computer and it crashed in setup. then I put in just the 64 and xp was running setup fine but as we all know 64mb is no good for xp. May I please get some help.