Hi, we've moved house recently and the movers seem to have knocked something in one of my PCs and it just refuses to turn on now. After the move and plugging it in, it emitted long beeps with pauses, which according to the Gigabyte motherboard, means bad RAM. I swapped the RAM and it still didn't work. I unplugged everything, leaving only the RAM and video card plugged in and it powered on the fans and hard drive, but I still got the beeps. I then removed the RAM and still got the beeps. Changed to a different slot and still got beeps. I tried a different power supply and still got beeps. OK, so I swapped the motherboard for another one I had lying around that is *supposed* to be working. Now after I power this one on, I get NO beeps at all! This is with the RAM only, this new motherboard has onboard video. I have tried swapping the CPUs as well. I bought a second hand AM2 processor. Other things: - no numlock lights on a keyboard if plugged in - I tried plugging in an enclosure open detection plug and still nothing! AFAIK, I have plugged in the motherboard header connectors properly. Are they supposed to go in only one way? It seems that no matter which direction I try them in, the power still comes on? I tried the speaker plug in different directions as well, but still got no sound. Do I HAVE to plug in a set of speakers with this motherboard? I have tried clearing the CMOS by removing the battery for about a minute and putting it back in, still nothing. Also, I have an ATX power supply with one of those detachable 24-pin type things?? I can choose to plug it in on the motherboard, or not plug it in? Should I plug it in? I'm not talking about the separate 12V 4-pin plug thingy. Just for reference, the motherboards are: http://www.gigabyte.com.tw/Products/Motherboard/Products_Overview.aspx?ProductID=2283 They are both GA-M55-S3, but one is 'plus' I think and one is not, I'm not sure.