im also new in using mac osx. but i found the answer how to penetrate the black screen booting then close the lid to continue opening.
just look for this file Dell 1525 Driver_Update_2009_05_27.
unzip and read the instruction for display trick and install.
then put a login password and restart you laptop.
just search to google: how to install hackintosh to inspiron1525..
i did this to my inspiron1525 and it work. no black screen and after logging in my password it work...
no need to close your lid to continue booting