Asus laptop wont power on

I have an Asus U56E and recently its wifi has been acting up, so I took it in to get it repaired. They re-installed the OS and installed a new wifi card. It was working perfectly fine so I decided to download Microsoft Office and I left my laptop alone while it downloaded. I only left it alone for about an half a hour. When I got back to it the screen had gone black and the power light had gone off. I pressed the power button to turn it on and the power light flashed on and then turn off again. Assuming it was dead, I plugged in the power cord except the battery LED light that shows if the laptop was charging or not didn't come on. I took out the battery and put it back in and then again plugged in the power cord and the charging light came on. I pressed the power button and again the power light flashed on and off and the charging light turned off.

I have tried everything, help me. I plan on taking it back to the guy that fixed it but I need my laptop tomorrow and I dont know if he'll be able to get it done by tomorrow.