Hey all, how is it going? Well anyway, I'm having quite some trouble figuring out an issue. I bought some Kingmax memory (1GB sticks) from newegg to put in my powerbook. This ram is working perfectly fine I must say! My powerbook is running awesome. Our plan was to take my old ram, two 512MB sticks and put them in my girlfriends powerbook. These sticks are the original ram from apple in my less than 2 month old powerbook. When I put this RAM in my girlfriends computer, I received a kernel panic on the first program I opened, photoshop. I'm sure you can guess where this is headed. Needless to say her computer wont come out of sleep mode, and kernel panics a lot! I've searched the forum, and have done about everything recommended on here. I've run disk checks, repaired permissions, run the memory tests from apple and memtest by way of rember. The memory tests show the memory as 100% okay. Her laptop has 2 256MB sticks identical (manufacturer, speed, etc.) to the 2 512MB sticks I have. I have put the 512 sticks back in my powerbook and they work just fine. For now I put her 256MB sticks back in hers and it has done a kernel panic once. Does anyone have any suggestions for a next step I can take? Sorry for the long post! Thanks!