Recently replaced the harddrive in my macbook pro after months of inactivity, now my macbook pro won't start

I own a summer 2008 model Macbook Pro.  Last year, my harddrive crashed but I had no way of fixing the macbook at the time.  Fast forward to yesterday, I replaced the harddrive in my Macbook Pro with a harddrive that I took from a western digital 320gb external hard drive.  Now the laptop isn't starting up.  I press the power button, the DVD drive seems to spin up and then...nothing.  No lights turn on, no other components make noise, the laptop simply stops booting.  Now, I haven't fully charged the battery (only about 40% charged based on the 5 indicator lights on the batter itself), so I was wondering whether or not a fully charged battery would make a difference.  Please let me know if you guys need clarification, I know I'm probably being very vague right now.
Thanks!

I appreciate your help, but please don't just put me down like that
Most of the people that come on here, like yourself, don't actually give a resume of their level of experience. They are extremely vaigue, and based on the small paragraph of information it's up to us to try to gauge what level this person is at.
This is an extremely difficult and frustrating thing to have to do, because if we get it slightly wrong either way, and people instantly take offence & go on the defensive. Even though we are all perfect strangers until 3 or 4 sentences ago!
If you don't already have this page up - http://support.apple.com/kb/HT3910
Have you another Install DVD you can try?
Can you boot from any other bootable media, such as a USB Drive? (Holding Option). Or a linux / windows install DVD.

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