>please help my computer says no operating system found
Can you get into DOS?
Is there a floppy in the drive? In which case it would say Non-system disk, (or not).
What about partitions, has by any chance one (boot drive) become unset as active?
Can you get into BIOS? What's your boot order? Does it match with what drives you have?

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Sincerely,
Andrew H. Carter