hi guys today i tried to open my pc as i always do to play some games but the pc instead to fully open as it always does stuck a a black screen with an A2 on the right bottom corner i tried first to disconnect my HDD just to see if its a disc error and my pc when i open it again booted normaly on my bios . The it was almost completly clear to me that the HDD has problem because i tried to connect and disconnect it 2-3 times and the same thing happend but just because i was also supsicious that it might be a PSU error i unistalled a hub i had installed in my mobo (sd/cf/usb2 hub)and i reconnected the HDD and my pc booted immediatly! . im really confused from the situation i described and i dont know what the problem was any ideas are appreciated thanks 
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