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 ?