Crashed

My desktop pc has crashed again. Usually, I can unplug it from the power source and after a bit, plug it back in and it will work. But that didn't fix it this time. I'm using my laptop tonight to surf the net. I will either have to buy a new desktop or spend the money I would spend on a new desktop and buy a new laptop. Remember, this laptop crashes too. But, knock on wood, it's been on for about 3 and a half hours and it hasn't crashed yet.