I just purchase a HP Pavilion 15-n211dx NB PC. And a book fell on the labtop while open and it shut off. When I turned it back on I was brought to a black screen that said please install an operating system on your hard disk. When I do a hardware diagnostics, the memory test works but the hard drive check says SMART CHECK: Not installed. And SHORT DST: Not installed. Please help the PC was loaded with windows 8 when I bought it
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