Macbook Pro making loud and weird noise

Okay, so I was just watching some videos on youtube and I fell asleep. Even the battery drained to zero% and hibernated. Then after around 7 hours when I woke up, and turned it on again then it started to make really weird noise from inside like hmmm I couldnt figure what was the problem, either the speakers? Fan? Hard-disk? Superdrive?
Then I turned it off and turned on again. It was quiet for a moment until the log in window appeared and started to making same noise again. Then I cleared PVRAM or something holding down Command+Option+P+R and Power Button then it is kinda fine now but still loud enough to bother people.
It seems like some wire or hmm something is stuck inside some moving part inside it but I am not sure. I just keep my Macbook Pro on the table all the time as a desktop I have never had such problem before.
Help please? What do I need to do? It's a

You said at the start that the battery discharged completely...did you plug the MBP in and recharge?  Does the MagSafe show it is charging or running on AC?
Does the noise sound lik a clicking, sound the hard drive stepping motor makes?  Or is it more of a hum, or a grating sound?  If the latter it could be a fault with a fan or a bad bearing in the hard drive.
How does it perform otherwise?
Might be a good candidate for a visit to the Apple genius bar and have the techs run some diagnostics.

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