Hello, I have a intel 15" macbook pro. I hadn't powered the computer on for a couple days and now when I try to turn it on, I can hear the computer start to boot and then there is a sort of high pitched "dying" noise and the computer loses power. This problem has happened in the past and I simply left the computer on the shelf for a month and it started working again. I now don't have a month to let this sit on the shelf so I was wondering if anybody knows what the problem is. When it dies, I hear the sort of beep noise coming from the bottom left of the computer if that helps diagnose the issue. Thanks ahead for any help or advice.