Alienware m17x R1 problems with Charger/Battery/BIOS

Hello!
I managed to save my M17X R1 from bing almost dead with problems posted on other threads. But now, Im facing a strange problem.

Each time I power up my PC, the "The AC adapter is not plugged in, PC will run on integrated graphics to save Power, Press F1 to continue, F2 to setup" message appears with beeps. I must say that, I DONT have a Battery plugged in (because its dead) and I have on the BIOS the "Warning about power adapter" option DISABLED. I don't have a clue on why is this problem going on. Also, even though the message says that PC will run on integrated graphics, I have on the BIOS the Hybrid and Integrated graphics DISABLED (and the other 2 options, PCIGen2 and the other, also Disabled).

I don't understand why is this happening since I have the latest BIOS (A07). Summed to this, one more problem that MAY be caused by the aforementioned problem. First, I have crashing issues on ALL of my games. I cant play Dota2, FarCry3, Torchlight 2, none of those, because they simply crash randomly, at random moments. I could be playing for 1 hour and no crash, and then, crashes every 30 mins. Im using the Nvidia drivers downloaded from the Dell Support site (257.38) because newer drivers made the crashes MORE often.

Anyone know something about this? I searched on the forums and tried a couple solutions with no success

 

If a BIOS update, a power drain and a CMOS clear don't fix it you will probably be facing a PSU or Motherboard issue.