Unfortunately, that sounds like it might be a bad motherboard. My G73JW did pretty much the same thing one month after I got it in Sept. All I could do was get the power LED to come on, but the rest of the system was dead. I had to RMA it with Asus who ended up replacing the motherboard, CPU, and GPU.
1) Asus G73JW-A1 🙂
2) Samsung Series 7 Ultra
2) Toshiba Satellite T235D-S1360