Hello there, recently I had my computer turned off for a while due to the fact my hard drive went. Although lately I had some important work to catch up on, so I got my spare HDD (I keep it for emergencys) which is a 80gb HDD which works fine, and plugged it in. After I plugged it in, I put the power plug in, the monitor plug in, and when I wen't to turn it on, dead. Your first conclusion is probably that the HDD caused this, no. I unplugged the HDD, nothing still. I'm not entirely sure what my motherboard is because I havn't got the papers anymore, but it's an AMD ATHLON (Don't know the model). When I went to make sure everything is plugged in, I saw a connector coming out of the psu, wasn't connected to anything. It's got multiple cables going into it and there only coloured black and yellow. Are these ment to go somewhere certain, or can they be left loose?