Hi - I have a Dell Inspiron 5547. It is shutting down without prompting (usually when I shut the computer or leave it unattended until it falls asleep) and then not starting up unless I take out the battery, unplug it, hold down the power and restart it. Often when I try to put the battery back in, it shuts off again. This is happening more and more frequently. I've run diagnostics and everything comes back clean. Ideas?