the power button for the case? if so this is the total wrong section for this...probably no where man you are probably SOL...the only place you can check is like acer online and see if they have it...other than that you can ghetto rig a button with a positive and ground lead to your mobo and make your own or something like that...maybe just buy a whole new case for it? can get cheapo cases for $20-$30 bucks or a power switch for like $5-$10