Qosmio F25-AV205 maintenance

I have a Qosmio model F25 laptop, and have owned it for a little over two years and recently it occured to me, that I have as of yet to open it and clear out any dust. So I decided to do so today but I cannot figure out how to get it open. I have unscrewed every screw on the bottom of it, and used every tab I could find, but it just will not open up. The sides of the laptop come loose but the middle area stays fastened, and I'm not one for forcing electronic equipment to open up if it does not want to. I've tried to find any info at all on opening it up, but all I could find was a Yahoo Anwers post saying that it was possible. Any ideas here would be appreciated, I would really prefer it if my laptop did not burn out because I could not clean out the dust.

 

Sorry about double posting, but I really need some help here.

 

Many laptops have screws that go both directions: from the bottom up into the top, and from the top down into the bottom. The top screws are probably under the keyboard. Laptop keyboards can usually be removed by using a micro-flathead screwdriver to 'pop' some tabs and the keyboard will then come up. Be careful: there's a "cable" that's more like a ribbon of plastic paper that connects the keyboard to the motherboard; this cable is very fragile and is easily damaged, and easily ripped loose from it's socket on the motherboard. So, when the keyboard is loose, very carefully lift it up and look underneath to see how the cable is connected and then try to move the keyboard out of the way of the screws without disconnecting it from the main board.