Dell XPS M1330 Laptop will not turn on normally.

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Hello,

I'm having some issues turning on my XPS M1330. The battery is fully charges and the AC power is connected. I turn off the laptop and it won't turn back on when I press the power button. The only way I can manage to turn it on is by disconnecting the battery, unplugging the AC power from the computer, then plugging the AC back in without the battery. When I do this, the computer turns on BY ITSELF as soon as I plug in the AC into the laptop.

Inclusively, immediately after the Dell logo with Bios version screen disappears, the screen goes blue and automatically begins the "Pre-boot system assesment build 4107." I have let it do a full diagnostic and it doesn't show me an errors. I've been cancelling it by pressing the ESC key in order to go onto the windows logon screen; I have to do this every time the computer turns on. On a side note- after I turn on the computer I can connect the battery and it disconnect the AC and the laptop will run on the charged battery.

Does anyone have an insight on why this is happening?