The computer worked for exactly 40 days and I only had very minor usage. I only used it for word and checking emails. It crashed today and I got a message saying error 1962: no operating system found. I researched online and followed instructions to reset BIOS and tried everything I can to make it work but failed. I ran diagnostics and memory, cpu were ok, just cannot detect hard drive, so I think it’s a hard drive issue. I’m not tech savvy and am very sad that I lost all my papers and documents that I have worked on for these 40 days.I messaged the seller two days ago and have not gotten a reply. I probably won’t get a reply since it had already passed the return time period. Indeed a very expensive lesson to learn (never buy a refurbished computer!)