I have a Toshiba Satellite M70 laptop that has 2x512MB sticks of DDR2 5300. I brought the computer to have the DC jack fixed and when I got it back I was getting nothing but errors from the ram, turns out a broken one was put back in, not the one I had. It runs fine off just the 1 working stick. Anyway I wanted to upgrade the ram to 2x1024mb sticks so i can run Win 7. I got 1 stick of the DDR2 5300 (store only had 1) and it will not boot. I get to the screen to load the bios or select boot device and it hangs there, I can't even get in to the bios. It's bascially acting like there's no ram installed at all. I put the 512 stick back in and the laptop runs like normal. Now the 2 sticks are the same except the size and since the 512 doesn't need to be paired I don't see that as the issue with the 1024. I've tried booting with the 1024 in both slots with and without the 512 paired with it, each time just get to the same spot and hang there. Could it be that I got a bad stick or is there something I'm missing?