on the blue screen you should also see a STOP error. Please post the exact verbiage of that for example: "Stop 0x0000007B or INACCESSIBLE_BOOT_DEVICE " then 4 sets of characters after that. Post that and if you can zip up the .dmp file and upload it here we can try to decipher what it says.

Here is a link to an article on what a lot of those can mean...

http://www.theeldergeek.com/stop_error_messages.htm