Hi,i installed the latest version of mobility centre from dells site but no change,the button remains useless,i get to mobility centre via control panel -mobility centre,not quite how dell planned it but i am afraid there are lots of firmware bugs on this particular laptop,when i first got it it had probs turning off then boot probs,i had bios a12,finally got all this sorted then updated to bios a13,big mistake,my laptop now has no access to any bios options so if you do update your bios i hope you have more luck than me,back to the the mobility button,well i just have given up on it,afraid the 7720 is a very well spec computer let down by totally rubbish firmware from dell,ho hum.Enjoy
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