Computer stopped working.

My desktop computer seems to have finally given up on me entirely. It just flat shut down last night as I was working on stuff. Can't get it to turn back on, well... it turns on, but no one is home. Signal don't make it to the monitor. Really depressing for me, I am now delegated to using my dad's puter and my lappy - don't like using lappy for work cause of how much work needs to be done, but dad's computer is mostly just for solitaire and writing in Word - plus the fonts are set to HUGE on it, making it really hard to work with for me.