Power Up Issues with MacBook Pro A1278

First-off, let me preface this question by stating that I know nothing to very little about computers, especially Apple computers. That being said, I have a MacBook Pro A1278 model. About a month ago, smoke started coming out of the top row of keys on the keyboard (not good at all - that much I do know); so, I powered it down. Then it would not power up at all. This morning, I tried plugging in the adapter and, lo and behold, it started to fire up. However, the progress bar only moves about a third of the way across before it shuts down again. It does this whether or not the adapter is plugged in or not, so I am thinking that it is not the adapter or the battery. If I continue to hold down the power button, it was going into my Desktop. However, as soon as I release it, within about 2 seconds, it shuts down again. Also, now when I continue to hold the power button down, it only makes it about halfway and then shuts off again. Could it be my power supply? something else? Any advice would be greatly appreciated as it is a work computer. Thanks.