Computer won't turn on after power outage

Hi, we had a power outage here for a couple of hours, and when the power came back on, my computer wouldn't turn on. The montior, speakers, printer, and everything else came on, just not the computer itself. There is a flashing green light in the back, so it must be getting some power. It's an HP Pavillion a510n. I would appreciate any help, Thanks.

 

Almost definately it's the power supply that's gone. You can get it tested at a computer shop to make sure, and get a replacment (or from the manufacturer).

 

Thank you, will do. Appreciate your help.