After my old psu overheated and died, I got a new one. Everything is plugged in correctly and i turn it on to be greeted with the disk boot failure. I check the hdd and its plugged in and so is my external drive but that doesnt help, i checked bios to make sure it was reading and it was but that didnt help. I even put in a windows 7 disk to an external optical drove and it still will not pick up on a fix for this. I really need some help guys.