My laptop just started turning off by itself after about an hour or so. Then when I tried to power it back on I got a message saying “Operating System not found.” Before I could wait an hour or so before I could get back into windows now it doesn’t seem to load windows at all. I’m pretty sure it may be a hardware issue with my hard drive but I’m not sure. I don’t have the Diagnostics cd that came with my laptop 5 years ago. Nothing is useful on Dell’s website. Have you seen this before? Thanks