For some reason on my desktop i was burning a cd and then suddenly i get a blue screen saying physical memory dump. So i held the power button and did a hard shutdown. Now when i restart my computer it is not recongnizing either my cd-rw or my dvd-rom. And i get the message system boot failure. please insert boot disc. I am desperate i have no clue what to do at this point if anybody has an idea what might be the problem or how i can fix please respond.