Constant thumping sound ...help?

Hey guys I'm writing this via my iPhone so bare with me if I can't go into too much detail but the issue I have right now is my hp G60-104CA laptop that as soon as I turn it on and I'm talking about the bios startup my speakers will begin to make a thumping sound and I seriously can't figure out what's going on I did a few google searches but nothing came up with my situation maybe I'm searching the wrong way but I'd appreciate any help of possible and hopefully this information helps :
it's running windows 7 just got it back from HP For replacement of the fan and heatsink had it for about 2 weeks since than nothing was wrong till about 20 mins ago
I've also tried plugging in headphones to see if the thumping would stop but no that didn't Change anything Also the thumps don't seem to ever stop they're just a constant beat ever like half a second
I knew that even disabling the audio devices wouldn't help but I tried that as well and my router is no where close to my laptop it's two floors away and i've also tried disabling the wifi as well nothing

Any help would be greatly appreciated thanks!

 

Meh, Disregard this message, I took apart the top of the laptop and turned it on it seemed to have stopped then it started again so instead of dealing with i just pounded it till it stopped...problem solved.

 

Alrighty than punching it was a temporary fix....what do you think guys...send it in? Waste another 2 Weeks???

 

Alright so following up on this is seems a screw under the battery in the middle was somehow causing my laptop to make this noise :S? If I put the screw in it beings to thump right away, if I take it out. Tada....problem solved.....weirdly enough.