My PC Is Dead Yet Again

I'm at the internet cafe right now. Damn PC gave up on me again last night. I'm so tempted to try and weasel my dad into buying me a new computer. And I can't be bothered to go fix it, especially when I've got no clue of what's wrong with it. At first it would turn on and stop just before starting to do the RAM check. Now it turns on, but the monitor just stays on stand-by. I changed the video card, that didn't do anything. I'm guessing it's more than likely that it's my power supply that's fucked up again, possibly my motherboard. I'd dread having to replace my motherboard. I've got such an old one. Well it means that my home entertainement has been heavily reduced. No more internet or Need For Speed.