Help! Macbook pro wont start!

So I have recently replaced my old HDD with the new Corsair 128GB SSD and everything was great. The installation was fast and it worked flawlessly.
One fine morning, it refuses to start. I press the power button and it would just start for 1 sec then turn off. I opened the macbook pro up and put back the old hdd just to see whether its the SSD but even then it wouldn't start up.
Any idea what could be wrong? I have double checked all the wires and everything which looks fine. Please help!

Insert the Applications DVD that came with the MacBook, press D key when your computer starts and run the extended test two times. If you haven't got a DVD, press D key when your computer starts

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Just replace the hard drive.
If he lost data, look at data recovery services*:
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Help! Macbook pro wont start!

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