This 820-3115 had waterdamage and wont start. I cleaned that and now it only starts if there is no monitor attached to it (internal and external). It i plug any monitor in fan just twitch once every time i press the power button. Without a screen it chimes but turns off after ~20 seconds. It beeps without ram and also stays on beeping forewer without ram (not turning off like it does with ram - i tested every combination of the two sticks in both slots and also one of mine - everytime with the same result.). If i "trick" it by starting it and instantly plugging in a external monitor after it chimed it shows a white screen but turns off same way as if there is no screen at all. I tested a known good LCD and it still wont start with the LCD connected. I measured all Pins of J9000 in diode mode and compared it betreen screen plugged in, screen unplugged and a working board (with screen plugged in and also unplugged) and i cant find any differences. So i am stuck.