Replacing the RAM and HDD does not void warranty. Most brands even have a step by step guide on their website on how to do it. I had replaced the RAM myself on my Acer and Dell laptops in past and had later claimed warranty on both of them without any issues. The dell did not have a seal on the cover but the Acer did. That seal was just for show I think.ashis_lakra said:simply replacing HDD by opening the backpanel voids warranty ? or adding extra RAM ? I think they have Seal on it.