Computer with no indication of booting.

Hello,

I own an Alienware m15x and the other day when I was on it, suddenly the screen suddenly had lines across and had major lag when I tried to move the mouse. I restarted, removed all the wires, battery, etc. turned it back on, but then it just came up with a blank screen. (LED lights go on and everything, screen backlight even goes on.)

So far I've removed the RAM, however, when I did, the motherboard did not recognize there was no ram in it, which could be a problem.

Please help!