A bit more information would be helpful.
Like what is happening? any error messages? has anything changed recently before the problem occurred? your full computers specs? is this a computer you built yourself, what make is the hard drive? if this one you bought from a shop what is the make and model of it?
You wouldn't phone a mechanic and say my car doesn't work what is wrong with it would you?
If you can answer the questions above then we will be able to help or find a solution for you.
Like what is happening? any error messages? has anything changed recently before the problem occurred? your full computers specs? is this a computer you built yourself, what make is the hard drive? if this one you bought from a shop what is the make and model of it?
You wouldn't phone a mechanic and say my car doesn't work what is wrong with it would you?
If you can answer the questions above then we will be able to help or find a solution for you.