As soon as the power cord is connected the power button LED turns Yellow. I know most Dells have an amber light but this one is more of a yellow color. The LED on the mobo comes on when the power cord is connected also and is amber or orange. The four indicator lights on the back of the mobo that usually give a code as to what is wrong never come on. There are no beebs. When you press the power button nothing happens. If you unplug the power cord the power button LED and the mobo LED stay lit for about 5-10 seconds before going off.
I have already taking a known working power supply from another dell and tried it with the computer but the same thing occured.
I have also re-seated the CPU and Memory as well as tried one memory module at a time.
I have disconnected every IDE cable and power connection and reconnected.
There are no cards because everything is onboard with the mobo so I could not disconnect the video card.
Any ideas? I am assuming there is a bad CPU or motherboard but don't really have a way to test that.
Thank you for your help.