I was checking out a friends Emachines C2684. He said the factory had replaced the mobo under warr about a year or so before. He also said it was "doing the same thing it did before", no boot, fans run and shut off.
The symptoms I reproduced were all fans came on, but no boot I tried the cpu in another board and it worked. I purchased another motherboard and installed it into the emachine case. Upon boot up it went to the bios set up screen. When I hit the F1 key nothing happened. Long story short and two keyboards later. My question is this: Has anyone ever seen a Power Supply internally cross circuit in such a way that it can short out the keyboard circuit in the motherboard? I installed another micro ATX mobo I had in the scrap pile and the same thing happened. The keyboard and the KB socket were shorted out or rendered inop. I have built about three hundred or so units and have never experienced this type of failure. Any comments would be appreciated? Thanks, MD
The symptoms I reproduced were all fans came on, but no boot I tried the cpu in another board and it worked. I purchased another motherboard and installed it into the emachine case. Upon boot up it went to the bios set up screen. When I hit the F1 key nothing happened. Long story short and two keyboards later. My question is this: Has anyone ever seen a Power Supply internally cross circuit in such a way that it can short out the keyboard circuit in the motherboard? I installed another micro ATX mobo I had in the scrap pile and the same thing happened. The keyboard and the KB socket were shorted out or rendered inop. I have built about three hundred or so units and have never experienced this type of failure. Any comments would be appreciated? Thanks, MD