HP 15‑f272wm 15.6″ Notebook ‑ Pentium N3540 was 4Gb Ram. I upgraded it to 8Gb Ram and now it shuts down. The screen gets all scrambled. Sometimes it won't boot at all. I reseated the RAM and checked all the connections...twice! This thing sucks. You have to remove the whole mother board to upgrade the memory! Bought the RAM from crucial which analyzed the system and said it was the compatible chip.