Presario F700, Widows Vista SP2, intermittently, it will not boot, and get the NO OPERATING SYSTEM FOUND. I am afraid to ever again turn it off. Any thoughts?
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You could try checking the data cable between the hdd and mb, replace it if you have a spare. If it's a sata drive some of the supplied cables were not so reliable. In that case I would be looking to get another to replace it.
Your hard drive is failing... based on the info you gave in your other post. If you have any data you want to keep, you'd best back it up now before the hard drive dies completely.