Computer won't start up anymore?

Hey you guys. So, I have this HP Invent and for some odd reason, it wont boot up anymore. Yesterday it was working pretty fine. On Friday, we switched to Hawaiian Tel to get a cheaper internet I guess. But anyway, yesterday my cousin was playing this online mmorpg game on my comp, no viruses. It froze on him, so then he just exited the game and closed Mozilla. Then I had this threat that avast picked up and blocked it. After, Mozilla didn't wanna open up so my sister restarted my comp. Then, next thing you know after the HP Invent screen with system recovery, boot menu etc options, it's a pure black screen! I really don't know what happened. I can't even go system recovery or go into safe mode because it'll do the same thing ._. anyone can help? Or any solutions? Please and thank you for your time.