Solve : not being able to read hard drive?

1.	Solve : not being able to read hard drive?
Answer» Well, the problem is SIMPLE, when i try to turn on my computer it detects all my 1.5 g of memory, my cd rom, and my cd burner. doesnt detect and doesnt detect my HD. It is not the HD that is messed up because i tried 2 other new HD's and still would get no detection. It happened to me once before, LIKE 3 days ago and all i did was remove all but 1 512 and it worked. Now i tired it again, same thing; wouldnt read my HD. All the CABLES are HOOKED up CORRECTLY and are plugged in tightly. Hopefully i can get some advice soon because i am in need of my computer right now. (This is being typed from a friends computer.) Thanks for the help and hope to have some feedback soon.

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