Help with band new Colby laptop.....?

I've had this laptop for 2 days and was talking to my family via yahoo messenger and web cam when I accidently hit the unlock swith to the battery and my screen went blank now I've tried turning it off and back on and it won't boot to windows it say push tab to go to post screen and del to setup... when I try those it says plz select boot device and press any key nothing is working and I don't have a cd drive any help would be great thanks and Merry Christmas