My Computer Screen is Black. No cursor sign.

So my computer was fine but when i woke up the next morning it wouldn't show anything. No one had been on it or anything. Virus? Maybe. Not sure. I followed other instructions like doing f8 and trying safe mode, all know configuration, stuff like that. I did the launch startup repair but it just goes back to the same screen. please help. we REALLY cant afford a new computer. please.