The lid switch is magnetic on my inspiron 6000 and I can use a small magnet in my cell phone case to operate this switch (located just above where the left lid latch hooks) to put my unit into standby. Since this works every time I don't think the lid switch is the fault. My problem with black screen is intermittent, but using an external monitor always seems to work. I have replaced the inverter/backlight board and no change. Help.