I have a dell dimension e521 and was working perfectly everyday. I decided to open it and switch processors to a dual core so it be a bit faster, and I put it in. The first time I turned it on my fan started racing faster and faster so I cut it off. Now when I turn it on, its fine, but the computer light is not green! It is a solid yellow, amber like light, and everything is running: the fan, power supply, and even the motherboard light is on yellow!(or amber). So I switched back to the single core: same thing!!
What can I do? I assume nothing is dead because everything is running, but it is a solid amber and wont show up on the monitor.