MacBook won't boot to HDD or detect network boot option

Hello,
I have a MacBook 4.1 with a 2.4 Ghz Intel C2D, 2Gb of RAM, 250Gb HDD running with 10.5.3.
My main issue is that whenever I try booting my MacBook to the hard drive the MacBook gets hung up. This happens at the grayish screen with the large apple picture in the middle and the spiny loading thing. This seems to be happening every time.
Also, my MacBook isn't detecting the network boot option when it should be.
I'm able to boot to a CD just fine.
Anyone have any suggestions? I'd like to try and get it going to the hard drive since I have some documents I'd like to get off. I did manage to get it working for a couple of hours. I did that by removing one of the RAM cards and then resetting the PRAM.
I'd appreciate anyone's help.
Thanks,
Smerky

On your desktop, double click "Install Mac OS X". Enter your administrator password and wait for your mac to restart. After that navigate to Utilities-->Disk Utility.

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