I came home yesterday and my home PC was off. I thought there may have been a power outage, but there wasn't. the computer would not turn on. I assumed it was the PSU even though it was a pretty new unit. I brought home two working PSU's from work and tried each, getting no response by pushing the case switch (I even tried disconnecting the power switch and jumping the pins with a screwdriver, to no avail). I then figured it to be a CPU or Mobo failure. I disconnected everything from the Mobo except the original PSU and the case speaker to see if I'd get some response and maybe some beep errors. All I got was that the PSU finally ran as soon as I plugged it in. I then put the processor back in and plugged in the CPU fan. Still the only activity came from the PSU fan and the CPU fan. There were still no beep codes even though there was no memory installed. I tried replacing the video card and connecting the monitor. When I plugged the PSU back in it immediately started running, the PSU fan ran and the Video card fan ran. There was still no video on the monitor. I then put a memory stick in. The same thing happened. As soon as I plugged in the PSU it started running, as well as the video card fan, but there was no other activity. I took it one step further and reconnected the main HDD along with the video card, the CPU and the memory. As soon as I plugged in the PSU it sounded like there was some kind of spinning coming from the HDD, yet there still was no other activity except the spinning of the PSU and heatsink fans. I'm assuming at this point that my problem is the Mobo or the processor. Given that the PSU, heatsink and the Video fans start spinning as soon as I plug in the PSU (without response from the case switch) I thought it was the Mobo. However, given that there is no other activity (beep errors, video, etc...) except the fans turning I also think it may be the CPU.
My system is an ASUS 8KN board with an AMD 64 3000+ processor. I was running 2GB corsair 400MHz PC3200 memory. I have an Nvidia 5700 AGP card. I was running a 160 GB IDE processor as well as an 80GB SATA drive as secondary storage.
I am assuming at this point that my problem is the CPU, the Mobo, or both.
Any help would be appreciated.