Robbieleics

Hi all,newbie here and desperately looking for your help please! I have a Samsung NP305V5A running win 7 home premium. In a rush, I've connected an external blue ray drive which was connected to an overpowered plug. As soon as I connected the device by USB the laptop powered off instantly and is now completely unresponsive. I've had the battery out, held down the power and tried again, tried disconnecting all USB devices and tried, left it to charge a while and tried, and reseated the ram. Nothing has worked yet. When pressing the power button, it literally does nothing at all, no boot, no noise, no light. The only thing I can see is the charging light comes on then it's plugged in, otherwise its a paperweight. Any help would really be appreciated please! Rob