my wwww... argg.. key is messed up!

i'm using a laptop, not sure hat's happened but the "w" key is being really un-responsive, i have to press it really hard to get it to work. i've taken the key off (plastic bit) but can't see anything obvious wrong or what i can do. any suggestions?

it's the same ith my ` key but that's not as annoying, just started today afaik.