Hello! Well when im powering on my laptop (alienware 17r3) there is a message " THE AMOUNT OF SYSTEM MEMORY HAS CHANGED. "

" THE AMOUNT OF SYSTEM MEMORY HAS CHANGED. IF YOU DID NOT CHANGE YOUR MEMORY... TO RESOLVE THIS ISSUE, TRY TO RESEAT THE MEMORY. STRICKE TO F1 KEY TO CONTINUE, F2 TO RUN THE SETUP UTILITY."

i triet reseating memory, but it appears after powering on again. can you help me?

ps. it is not on everytime. it appears sometimes. thanks!