My son-in-law gave me my grandson's used Dell laptop, Inspiron 3520. I fiddled a bit with Windows 8 on it but decided I'd rather have my own Win7 image (saved on my external USB drive) copied to the boot. I didn't know that Win8 wouldn't boot from a CD (imaging restore disk) without some work. After looking that up and learning about tweaks to the UEFI boot involving enabling 'legacy ROM', I was able to boot on my CD and 'restore' my Win7 image to the laptop. Seemed fine, but then it won't boot from the internal HD. After about 2 seconds of booting it reports exiting PXE (BIOS?) and please insert disk. But I've tried 3 boot disks, none of them give an option to exit and boot from the HD. OK, then, break into BIOS via F2 or F12 right on power up. That works, but then I get stuck, in over my head. I'm unable to bypass the legacy (maybe I shouldn't?), unable to set it to boot from the HD.