Got an old Dell Inspiron 560s from my girlfriends mom, she said it would never turn on, I got it to turn on after some tinkering but now it is completely losing power at random, shutting off, turning back on and after a random amount of time, back off again. One time I actually got it signed in, off, while messing around in the BIOS, off, while its on a loading screen, off. I have no clue what it is, please help!