I recently bought a new motherboard and quickly realized it would not fit into the case I have. I had already disconnected and removed the original board, and as regretfully such I put it back inside, reconnected all the wires (both inside and out) and turn it back on. Keep in mind I STILL HAVE VISTA, and before the os would boot, I got Large blue screen. I have searched and searched the internet trying to figure out what I had done wrong. From what I could find the error has something to do with the hard drive, so ran a chkdsk and found no problems with the hard drive, and I checked the ram just to be sure. Everything is plugged in and clean of dust. I am completely lost when it comes to this thing, and I naively did not back up the computer beforehand, so re installing the OS is a no-go. So to all you computer guru's, please tell me what I can do to fix this thing?