I recently bought a kv8 pro amd athlon 64 754 motherboard off ebay. It appeard in box and the owner said it was new and un-used. So I went and bought a case with a 400w PSU. WHen i went to connect the PSU to the motherboard, i noticed a yellow 4-pin plug cellotaped to the main power plug that gets plugged into the motherboard. THe letters 20+4 was written on the end of the cable head, what is the extra 4-pin plug for?
ANyhow i installed ram and i installed a video card, and the processor and heatsink obviouslly ( though the fan is not very secure in place! ), and went to turn on the box pressing the switch at the back of the PSU ( then pressing the switch at the front, which does nothing at all there is no response from the motherboard ), all that comes on is the green light on the motherboad and down in the “post code” LED thingie what resembles 2 letters ‘JJ’ or upside down 7’s!!! There is no noise off the motherboard to suggest it is loading up or doing anything. what am i doing wrong? what do i need to check for? is the motherboard dead?