Why doesn't my laptop turn on all the way?

My laptop won't turn on. The power button lights up like it on, but it appears to be in sleep mode. I can turn it off and back on but it just goes straight to the sleep mode. The screen remains completely black but I can hear the fan running. I took it to a guy and he thinks it is dead. I think it's just a virus but I don't know much of anything about computers.

Am I wrong? What's wrong with it?

It had just "updated" before it started this.

What should I do?