I have an Acer Aspire 3009WLCI (essentially a rebadged 3003WLCI) that came with 512 (2 x 256) PC2700 SODIMM RAM. I decided to upgrade the memory when Best Buy put PNY Optima PC2700 1GB SODIMM RAM on sale this week, bought 2 sticks. The PNY configurator told me beforehand that this RAM (retail part # N1GBD27OPT, matching the same info on the packaging I'm looking at) was the right part for my laptop. I took out the 256 sticks, put in the 1GB sticks, and it wouldn't boot up (blank screen). Put the 256 sticks, everything works fine. 1GB stick by itself, won't boot. 1GB with a 256, nothing. Put the 256 sticks back in, it's running fine again. What the heck is up???? I sure would appreciate any help! Thanks!