I have hackintoshed my dell inspiron 1525 but because i have a lot of school work that requires using window, i have decided to partition my hackintosh and put win 7 on it. but after installing win 7, i cannot go back to mac osx... and i dont see mac osx when i'm trying to change default boot partition. how can i go back to my mac?

Normally it is suggested that when dual booting OSX &Win 7, they should be put on 2 separate drives because of that very problem.

My suggestion to you is to get either boot 123 or Chameleon 2 ...
put 1 of them on to a CD,
boot up the PC with the boot cd

then you will see 3 choices...1) chameleon boot..2) Mac OSX 3) Win 7

this will get you back in so you can get your stuff but ,

I suggest that you don't keep them both on the same disk drive period...

Why? because if one of them give you any trouble then you are screwed Twice over.

hope my advice was helpful.

it looks something like this