Dell :: XPS M170 Won't Boot

I have a dell xps m170 laptop I got back in April of last year, and I forgot to renew my warranty, so it's expired. My problem at the moment is that a few times the past week, I'd be using the computer normally and the screen would go black and everything would stop. I'd try to turn it back on, but wouldn't go to BIOS screen.

I would wait a few minutes, come back, power on again, everything would work fine. Then on Wednesday of last week, it crashed again, but would not go to the Dell screen/BIOS etc, just turn on, fans and lights go on, but just a black screen. I'd wait it out a few minutes, no change.

I took out the Hard Drive, tried to boot up still, powers on, but no Dell screen or anything. I took my computer to Geek Squad thinking they can tell me what my problem is, so I paid them 60.00$ to identify the issue. A day goes by, and they tell me after completing some sort of tests, that it may be a motherboard issue of some sort.

I go to pick it up, and they weren't able to tell me any specifics, they just said, we think it's the motherboard.