Wifi goes on and off, backlit keyboard doesn't work and no sound since Lion  upgrade. I can get the wifi back by going into safe mode and re booting(someone suggested on here), but can't let computer die or turn off or have to do it again.

My Wifi connection goes off if computer dies or shuts off, I can only make it work if I go into safe mode and reboot, it was just that, but now my keyboard doesn't light up like it's supposed to in low or no light and in system preferences it's like it doesn't exist.  Also, the sound doesn't work, I can't turn it up or down, it shows the sound icon grayed out and the anti symbol when I push F11 and F12, also it's like it doesn't exist in system preferences either. I have never had any problems with my MB Pro, I purchased in Feb. 2010. , but I upgraded to Lion last month, I haven't been using my laptop as much since I had an Ipad I given to me, so I think that's why I didn't notice these issues right away. What do I do? HELP!! Do I take it to Apple? I don't have the Apple care warranty, so will it be expensive for them to fix? Can I get my money back for Lion if I restore to Snow Leopard?

Take it to an Apple store or AASP. How much it will cost will depend on their determination of the problems. To bad you didn't purchase extended AppleCare. No you don't get your money back for purchasing Lion.

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