I have a Vostro 200 Slim Tower <ADMIN NOTE: Service tag removed per privacy policy>  that is only about a year and a half old and it will not start up or post for me. When I press the power button the processor fan spins constantly at full speed and that continues indefinitely. It just sits there and speeds at high speed but I get nothing on the screen.

-The LED on the Power Supply is solid green

-When I press the power button on the computer, the LED turns off and does not come back on. However the fan on the processor spins at full speed.

-The amber light on the motherboard is lit

-I have disconnected all peripherals and no change

I am thinking it is either a bad motherboard or power supply. I would be greatly appreciative of and input from someone who might know what is wrong with it.

Thank you