My PS3 Slim Cech-2001A Turns On and Off.

I have had my PS3 Slim for almost 4 years, and it has never given me a problem until these last 2 months. Recently when I first try to power it on, it will turn on then right back off. After multiple attempts it will eventually get to where it stays on for about 15 seconds, then it starts working, then it stops. Usually, after a couple more tries, it starts working. This process usually only takes roughly 5 minutes, then it works fine for the rest of the day, but the next day I would have to repeat the process. Today, however, it would not power up, it would just keep turning on then off. After about 15 minutes of messing with it, I started looking for solutions and I couldn't really find any which were like mine. They usually had different situations then me. I hope it can be fixed.