My Windows 7 system locked up one day (last Feb) and I couldn't get it to boot up with the Windows install disk in the DVD/CD drive. I also went to Bios and set the first boot disk to CD. If it has a bad disk drive then how did that happen during a crash? I bought a new hard drive for it (it originally had a SSD). I guess the next thing to do is buy a new cd rom drive and see if it will boot up then.