My computer won't recognize my HDD

[jail10]

One of my computers won't recognise the HDD. I searched on google, on forums but i still couldnt find any solutions.
The problem is that when i try to power on the PC, a black screen pops up and nothing happenes. I entered the CMOS screen , i checked if the HDD is detected , and guess what - it's not, although its set on automatic. Now i know for sure that the HDD is completely functional. The jumper is socketed according to the manual.
Can you give me an idea please ?

 

[Tedster]

sounds like a mobo issue, not a hd issue. Do you get a POST?

 

[jail10]

sounds like a mobo issue, not a hd issue. Do you get a POST?

If it is a MB issue then its not the whole MB , as i sayed i could enter bios, the cpu works just fine and again , i can hear the HDD starting. Im sure its not the MB . Maybe its the IDE socket ? I have to admit, this is an old pc. But I only use it for office stuff. I have another rig for gaming and others... .

And what ya mean with the "POST" thing ?