Dead Space, Dead Space, Dead Space

I have an Alienware M17x R3 with dual graphics card, an integrated Intel card for battery savings, and an AMD Radeon for gaming. However, my problem is that my AMD card seems to have dissapeared. It no longer shows up on BIOS or device manager, so I can't switch over from the Intel card (which obviously puts a damper on my gaming). I've had this problem once before, but if I recall correctly, I just reset the BIOS options and everything works (of course, I could have just accidentally fumbled around and did something else). Also, when I right click on my desktop, there used to be an option to go to the Graphics Switching panel, which would allow me to switch which graphics card I was using. That option no longer appears when I right click, and usin the Fn command to switch the cards does nothing. If anyone has any idea as to how to fix this, even a suggestion would be great.

These are the specs of the Alienware M17x I've been looking at. It costs about $2500. I'm not too much of a tech person, so I'd like to know if this computer will handle the games coming out this summer (Space Marine, Rage, Deus Ex 3).

PROCESSOR Intel® Core™ i7 2720QM 2.2GHz (3.3GHz Turbo Mode, 6MB Cache)

OPERATING SYSTEM Genuine Windows® 7 Home Premium, 64bit

MEMORY 8GB Dual Channel DDR3 at 1333MHz (4DIMMS)

VIDEO CARD 2GB GDDR5 AMD Radeon™ HD 6970M

HARD DRIVE 750GB 7,200RPM HDD

LCD PANEL 17.3-inch WideFHD 1920 x 1080 60Hz WLED

WIRELESS CARD Intel® Ultimate N WiFi Link 6300 a/g/n 3x3 MIMO Technology

INTERNAL OPTICAL DRIVE Slot-Load Dual Layer DVD Burner (DVD+-RW, CD-RW)

I'm in the market for a gaming laptop (I know desktops are better, but I need a laptop), and I don't know of any good brands other then Alienware, which I know is considered overly expensive. I'm mainly looking to play MMOs like WoW and TOR, but I'd also like to play newer games like WH40K Space Marine and Deus Ex 3. However, I don't want to play excessively just to play those games on Ultra. My budget is around $2500.