You probably already done this.
Double check the tags on the sticks to make sure they are SODIMM DDR2 533 (PC2-4200) CL=4, Unbuffered, Non-ECC, 1.8v. or DDR2 667(PC2-5300).
I bought two sticks with packages marked DDR2 533 for my daughters laptop and when I got home the sticks in the packages were something else.
Check to make sure each stick is firmly seated in the slot and the clips on both sides have clicked into place.
Check each stick separatly in the same slot. One could be bad.
Slot could have gotten damaged. Should be able to check by using the same stick in each slot or put the 512's back in.
Outside of that I don't know what to suggest. Never had a problem like that before.
Double check the tags on the sticks to make sure they are SODIMM DDR2 533 (PC2-4200) CL=4, Unbuffered, Non-ECC, 1.8v. or DDR2 667(PC2-5300).
I bought two sticks with packages marked DDR2 533 for my daughters laptop and when I got home the sticks in the packages were something else.
Check to make sure each stick is firmly seated in the slot and the clips on both sides have clicked into place.
Check each stick separatly in the same slot. One could be bad.
Slot could have gotten damaged. Should be able to check by using the same stick in each slot or put the 512's back in.
Outside of that I don't know what to suggest. Never had a problem like that before.