When should I power rake my lawn?

I think I'am over watering my lawn, I have brown spots all over my lawn, what is the matter, It's been fertlized. Or am I overwatering my lawn. My lawn is on the west side of my home. Should I have it power raked? I have been raking it by hand and I'm getting all sorts of dead grass. Thanks

Answers:
~I'm glad to see someone on this site finally interested in the pressing issues of the day. I'd plow it under and plant an English garden. In fact, I did just that. My neighbors love it.

Other answers:
Until grass reaches your house window sil
Until grass reaches your house window sil
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