Dell Dimension amber power light blinking

[bluehose23]

I have a Dell Dimension 5150 desktop that is 4 years old (kids computer).  Worked last week but now cannot even power it down by holding the power button.  The power button just keeps blinking an amber light.  I have unplugged everything then plugged back in, tested all the cords.  Any thoughts?

Leah

[Computer_Commando]

Right from Dell:
http://support.dell.com/support/edocs/systems/dim5150/en/sm/tshoot1.htm#wp1120147
See System Lights:
Blinking Amber:  A power supply or system board failure has occurred.
Check the diagnostic lights to see if the specific problem is identified. Also, see "Power Problems" in your computer Owner's Manual.
Scroll down a bit further to see Diagnostic Lights.

[bluehose23]

Thanks so much!