I have a Compaq Evo N1020v laptop and this is my problem: the battery is dead for a while now, but every once in a while (I tend to think it's everytime the laptop stays disconnected from the AC power for more than 10 hours), the BIOS resets itself I've already replaced the small CMOS battery and still nothing when I said the battery is dead, I meant the big one, not the CMOS ... what might cause this ? It's frustrating to have to setup the BIOS daily