Macbook won't turn on...sleep light blinking

I am working on my sister's macbook, and I just installed new RAM and a new battery. I followed the instructions to a T and everything went fine until I tried to reboot. Now, all it does when I power up is it seems to go into sleep mode. The front light blinks, and the screen remains black. Any ideas on what is going on? I have tried putting the old RAM/battery back in and the same thing happens.
Please help...i need to fix it so she doesn't kill me!

You're probably not getting the RAM modules seated tight enough. The can go in real hard.
-Bmer
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