I have a dell Inspiron 15 i7559. One day I left it to charge like normal. In the morning after my charging cable had no indication and the laptop was completely dead. I left it to charge for 10 minutes and it did not boot. The indicator light turns on from the laptop for a brief moment. The charging cable had its blue led on also. The backlighting on the keyboard and power button is dead and so is the screen please help.