Crucial normally carry lifetime warranties on their ram so definitely contact them. However, if you purchased the ram via Novatech contact them instead first as they have been great for me in the past when needing to do an RMA on hardware. If something is still under warranty, but they can't obtain a direct replacement, they have offered me a new for old of equivalent price asking me to pick something up to a certain value from their existing site/catalogue, so a great service.