Acer Aspire L310 - Will not boot, will not beep

Question

My 1 1/2 year old Acer Aspire L310 desktop was working and all of a sudden it wasn't. It will not boot. It does not beep when turned on like used to. There appears to be no power to the mouse or keyboard. We were able to disconnect the hard drive and copy the important files over to another computer. We've tried turning it off, unplugging, switching off the power supply to see if that helps but doesn't. Does anyone have an idea about what it could be? Please help! I have online courses with finals coming up and can't afford a new computer at the moment. Thank you for any help anyone give me.