My five year old Inspiron 8200 has finally died. For about a week it said it was running on batteries, even though it was plugged in. If you unplugged it, it would instantly shut down. Or if you took out the battery while it was plugged in, it would do the same. Now it does absolutely nothing when I push the power button. I've tried the usual fixes, taking out the battery, unplugging it for awhile, holding down the power button for a minute, etc.
Does this sound like a motherboard failure?